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Monographie ausleihbar

F-&-E-Verträge - das ist zu beachten : gewerblicher Rechtsschutz, Kartellrecht, Compliance, Steuerrecht (2011)

Milbradt, Claudia ; Besen, Marc

Stuttgart [u.a.] : Boorberg

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Signatur: IASS 15.89488

Schlagwort(e): Deutschland ; Forschung und Entwicklung ; Vertragsrecht

Materialart: Monographie ausleihbar

Seiten: 183 S. , Ill., graph. Darst. , 22 cm

ISBN: 9783415046658 (Pp.)

URL: Inhaltsverzeichnis

Sprache: Deutsch

Zweigbibliothek: RIFS Bibliothek

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Potential effects of global warming on oilseed rape pathogens in Northern Germany (2012)

Siebold, M. ; von Tiedemann, A.

In: Fungal Ecology 5 :6 2-7 2

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Publikationsdatum: 2012

Beschreibung: Übersicht über bisherige, dokumentiere Zusammenhänge einer Klimaänderung und pilzliche Krankheiten in Raps, Abschätzungen über das Auftreten von Verticillium longisporum, Sclerotinia sclerotiorum, Alternaria brassicae und Phoma lingam an Raps in der Zukunft KATASTER-BESCHREIBUNG: Projektionen über das Auftreten von pilzlichen Pathogenen in Raps, Basiszeitraum 1971-2000, Szenario A1B, REMO, 2001-2030 und 2071-2100, Zusammenhang zwischen Grad-Tagen(〉0°C), Pflanzenentwicklung und Krankheitsparametern als Regressionsfunktionen im Artikel, jedoch sind feiner aufgelöste Projektion von RCM als Tageswerte erforderlich, um Wachstumszyklen zu simulieren und genauere Aussagen zu erhalten KATASTER-DETAIL: Delta T +, dann Zunahme von Verticillium longisporum, Sclerotinia sclerotiorum, Alternaria brassicae und Phoma lingam an Raps, Signal verstärkt im Szenarienzeitraum 2071-2100, Abnahme von Pyrenopeziza brassicae

Schlagwort(e): Deutschland ; Sachsen, Niedersachsen, Norddeutschland ; 1971-2000 ; Szenarien ; Infektionskrankheiten ; Temperatur ; Raps

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Das gegenwärtige und frühere Vorkommen der Malaria und die Verbreitung der Anophelesmücken im Gebiete des Deutschen Reiches (1927)

Schuberg A.

In: Arbeiten aus dem Reichsgesundheitsamte 59

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Publikationsdatum: 1927

Schlagwort(e): Deutschland ; Umweltmedizin ; Infektionskrankheiten

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Floren-Elemente und Temperaturverteilung in Deutschland. (1927)

Werth, E.

In: Ber. Deut. Bot. Gesellschaft 45:638-643.

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Publikationsdatum: 1927

Beschreibung: Einfluss der Temperatur auf die Flora und ihre Verteilung in Deutschland KATASTER-BESCHREIBUNG: KATASTER-DETAIL:

Schlagwort(e): Deutschland ; Botanik ; Klima ; Phänologie ; Temperatur

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Trend in den jährl. Hochwassermax. 1951-2003 (2012)

Hattermann, F. F. ; Kundzewicz, Z. W. ; Vetter, T. ; [weitere]

In: Hattermann, F. F., Z. W. Kundzewicz, H. S., T. Vetter, W. Kron, O. Burghoff, Y. Hauf, V. Krysanova, F.-W. Gerstengarbe, P. Werner, B. Merz, A. Bronstert (2012a), Flood risk in holistic perspective - observed changes in Germany. In: Changes of flood risk in Europe, IAHS Press, Wallingford, 212-237.

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Publikationsdatum: 2012

Beschreibung: Simulierte und beobachtete Trends der jährlichen Hochwassermaxima KATASTER-BESCHREIBUNG: Trend der Zu- bzw. Abnahme der Andauer der jährlichen Hochwassermaxima in Deutschland für die Vergangenheit KATASTER-DETAIL: Abnahme des mittleren jährlichen Abflusses um 35 % in Baden-Württemberg (Pegel Achstetten/Baierzer Rot) bzw. 21 % in Brandenburg (Pegel Ketzin/Havel) Zunahme des mittleren jährlichen Abflusses um 84 % in Bayern (Pegel Breitenbachkamm/Breitach) bzw. 74 % in Bayern (Pegel Kalteneck/Ilz)

Schlagwort(e): Deutschland ; 1951-2003 ; Witterungsextreme ; Hochwasser

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Two-dimensional Fe-based half-metals with vanishing net magnetization (2011)

Masao Nakao

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-09

Beschreibung: Author(s): Masao Nakao We discuss quasi-two-dimensional (2D) half-metallic (HM) antiferromagnets (AFMs), or fully compensated half-metallic ferrimagnets, that have no spontaneous magnetization, yet have 100% spin polarization of their conduction electrons. Using a full-potential augmented plane-wave method within density ... [Phys. Rev. B 83, 214404] Published Wed Jun 08, 2011

Schlagwort(e): Magnetism

Print ISSN: 1098-0121

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Thema: Physik

Publiziert von American Physical Society (APS)

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Forces exerted by a correlated fluid on embedded inclusions (2011)

Anne-Florence Bitbol and Jean-Baptiste Fournier

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-09

Beschreibung: Author(s): Anne-Florence Bitbol and Jean-Baptiste Fournier We investigate the forces exerted on embedded inclusions by a fluid medium with long-range correlations, described by an effective scalar field theory. Such forces are the basis for the medium-mediated Casimir-like force. To study these forces beyond thermal average, it is necessary to define them i... [Phys. Rev. E 83, 061107] Published Wed Jun 08, 2011

Schlagwort(e): Statistical physics

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Thema: Physik

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Theoretical study of the role of the tip in enhancing the sensitivity of differential conductance tunneling spectroscopy on magnetic surfaces (2011)

Krisztián Palotás, Werner A. Hofer, and László Szunyogh

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-11

Beschreibung: Author(s): Krisztián Palotás, Werner A. Hofer, and László Szunyogh Based on a simple model for spin-polarized scanning tunneling spectroscopy (SP-STS), we study how tip magnetization and electronic structure affects the differential conductance ( dI / dV ) tunneling spectrum of an Fe(001) surface. We take into account energy dependence of the vacuum decay of electron s... [Phys. Rev. B 83, 214410] Published Fri Jun 10, 2011

Schlagwort(e): Magnetism

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Linear response formula for open systems (2011)

Onuttom Narayan

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-11

Beschreibung: Author(s): Onuttom Narayan An exact expression for the finite frequency response of open classical systems coupled to reservoirs is obtained. The result is valid for any conserved current. No assumption is made about the reservoirs apart from thermodynamic equilibrium. At nonzero frequencies, the expression involves correlati... [Phys. Rev. E 83, 061110] Published Fri Jun 10, 2011

Schlagwort(e): Statistical physics

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Analysis of excitability for the FitzHugh-Nagumo model via a stochastic sensitivity function technique (2011)

Irina Bashkirtseva and Lev Ryashko

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-11

Beschreibung: Author(s): Irina Bashkirtseva and Lev Ryashko We study excitability phenomena for the stochastically forced FitzHugh-Nagumo system modeling a neural activity. Noise-induced changes in the dynamics of this model can be explained by the high stochastic sensitivity of its attractors. Computational methods based on the stochastic sensitivity functi... [Phys. Rev. E 83, 061109] Published Fri Jun 10, 2011

Schlagwort(e): Statistical physics

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Thermodynamic laws and equipartition theorem in relativistic Brownian motion (2011)

T. Koide and T. Kodama

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-11

Beschreibung: Author(s): T. Koide and T. Kodama We extend the stochastic energetics to a relativistic system. The thermodynamic laws and equipartition theorem are discussed for a relativistic Brownian particle and the first and the second law of thermodynamics in this formalism are derived. The relation between the relativistic equipartition rela... [Phys. Rev. E 83, 061111] Published Fri Jun 10, 2011

Schlagwort(e): Statistical physics

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Energetic stability and magnetic coupling in (Cr_{1-x}Fe_{x})_{2}O_{3}: Evidence for a ferrimagnetic ilmenite-type superlattice from first principles (2011)

Hasan Sadat Nabi and Rossitza Pentcheva

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-17

Beschreibung: Author(s): Hasan Sadat Nabi and Rossitza Pentcheva Based on density functional theory (DFT) calculations with a Hubbard U -term, we explore the possibility to design an artificial ferrimagnet FeCrO 3 of ilmenite type out of the two antiferromagnets α - Fe 2 O 3 and α - Cr 2 O 3 . By varying the concentration of Fe in α -Cr 2 O 3 , we provide a phase diagram of the re... [Phys. Rev. B 83, 214424] Published Thu Jun 16, 2011

Schlagwort(e): Magnetism

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Long-range magnetic ordering in Na_{2}IrO_{3} (2011)

X. Liu, T. Berlijn, W.-G. Yin, W. Ku, A. Tsvelik, Young-June Kim, H. Gretarsson, Yogesh Singh, P. Gegenwart, and J. P. Hill

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-17

Beschreibung: Author(s): X. Liu, T. Berlijn, W.-G. Yin, W. Ku, A. Tsvelik, Young-June Kim, H. Gretarsson, Yogesh Singh, P. Gegenwart, and J. P. Hill We report a combined experimental and theoretical investigation of the magnetic structure of the honeycomb-lattice magnet Na 2 IrO 3 , a candidate for a realization of a gapless spin liquid. Using resonant x-ray magnetic scattering at the Ir L 3 edge, we find three-dimensional long-range antiferromagneti... [Phys. Rev. B 83, 220403] Published Thu Jun 16, 2011

Schlagwort(e): Magnetism

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Spin-wave damping in ferromagnetic stripes with inhomogeneous magnetization (2011)

Hoa T. Nguyen, A. Akbari-Sharbaf, and M. G. Cottam

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-17

Beschreibung: Author(s): Hoa T. Nguyen, A. Akbari-Sharbaf, and M. G. Cottam A theory is presented for the interactions between the dipole-exchange spin waves in ferromagnetic nanowires with a stripe geometry. A Hamiltonian-based approach is used in order to extend earlier results for the linear (or noninteracting) spin waves to include the leading nonlinear processes due to... [Phys. Rev. B 83, 214423] Published Thu Jun 16, 2011

Schlagwort(e): Magnetism

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Lévy stable two-sided distributions: Exact and explicit densities for asymmetric case (2011)

K. Górska and K. A. Penson

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-17

Beschreibung: Author(s): K. Górska and K. A. Penson We investigate functions g ( α , β ; x ) which are heavy-tailed Lévy stable probability distributions of index 0〈 α ⩽2 and appropriate asymmetry parameter β . They are of central importance in physics of amorphous and disordered systems, econophysics, geology, hydrology, internet traffic, dynamics of human... [Phys. Rev. E 83, 061125] Published Thu Jun 16, 2011

Schlagwort(e): Statistical physics

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Phase transitions in the three-state Ising spin-glass model with finite connectivity (2011)

R. Erichsen, Jr. and W. K. Theumann

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-17

Beschreibung: Author(s): R. Erichsen, Jr. and W. K. Theumann The statistical mechanics of a two-state Ising spin-glass model with finite random connectivity, in which each site is connected to a finite number of other sites, is extended in this work within the replica technique to study the phase transitions in the three-state Ghatak-Sherrington (or random Bl... [Phys. Rev. E 83, 061126] Published Thu Jun 16, 2011

Schlagwort(e): Statistical physics

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Influence of aperiodic modulations on first-order transitions: Numerical study of the two-dimensional Potts model (2011)

D. Girardi and N. S. Branco

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-17

Beschreibung: Author(s): D. Girardi and N. S. Branco We study the Potts model on a rectangular lattice with aperiodic modulations in its interactions along one direction. Numerical results are obtained using the Wolff algorithm and for many lattice sizes, allowing for a finite-size scaling analyses to be carried out. Three different self-dual aperiodi... [Phys. Rev. E 83, 061127] Published Thu Jun 16, 2011

Schlagwort(e): Statistical physics

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Composition-tuned smeared phase transitions (2011)

Fawaz Hrahsheh, David Nozadze, and Thomas Vojta

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-18

Beschreibung: Author(s): Fawaz Hrahsheh, David Nozadze, and Thomas Vojta Phase transitions in random systems are smeared if individual spatial regions can order independently of the bulk system. In this paper, we study such smeared phase transitions (both classical and quantum) in substitutional alloys A 1- x B x that can be tuned from an ordered phase at composition x =0 to ... [Phys. Rev. B 83, 224402] Published Fri Jun 17, 2011

Schlagwort(e): Magnetism

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Generalized Langevin equation with multiplicative noise: Temporal behavior of the autocorrelation functions (2011)

R. Mankin, K. Laas, and A. Sauga

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-21

Beschreibung: Author(s): R. Mankin, K. Laas, and A. Sauga The temporal behavior of the mean-square displacement and the velocity autocorrelation function of a particle subjected to a periodic force in a harmonic potential well is investigated for viscoelastic media using the generalized Langevin equation. The interaction with fluctuations of environmental ... [Phys. Rev. E 83, 061131] Published Mon Jun 20, 2011

Schlagwort(e): Statistical physics

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Sequences of phase transitions in Ising models on correlated networks (2011)

Jörg Menche, Angelo Valleriani, and Reinhard Lipowsky

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-21

Beschreibung: Author(s): Jörg Menche, Angelo Valleriani, and Reinhard Lipowsky Using the generic example of Ising spins on scale-free networks, we demonstrate that degree-degree correlations can induce a large number of thermodynamically stable states in networks that otherwise exhibit only the two completely ordered states. The additional stable states are related to the laye... [Phys. Rev. E 83, 061129] Published Mon Jun 20, 2011

Schlagwort(e): Statistical physics

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Entanglement entropy of the two-dimensional Heisenberg antiferromagnet (2011)

H. Francis Song, Nicolas Laflorencie, Stephan Rachel, and Karyn Le Hur

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-22

Beschreibung: Author(s): H. Francis Song, Nicolas Laflorencie, Stephan Rachel, and Karyn Le Hur We compute the von Neumann and generalized Rényi entanglement entropies in the ground-state of the spin- 1/2 antiferromagnetic Heisenberg model on the square lattice using the modified spin-wave theory for finite lattices. The addition of a staggered magnetic field to regularize the zero modes associ... [Phys. Rev. B 83, 224410] Published Tue Jun 21, 2011

Schlagwort(e): Magnetism

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Switching dynamics of a magnetostrictive single-domain nanomagnet subjected to stress (2011)

Kuntal Roy, Supriyo Bandyopadhyay, and Jayasimha Atulasimha

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-23

Beschreibung: Author(s): Kuntal Roy, Supriyo Bandyopadhyay, and Jayasimha Atulasimha The temporal evolution of the magnetization vector of a single-domain magnetostrictive nanomagnet, subjected to in-plane stress, is studied by solving the Landau-Lifshitz-Gilbert equation. The stress is ramped up linearly in time, and the switching delay, which is the time it takes for the magnetiza... [Phys. Rev. B 83, 224412] Published Wed Jun 22, 2011

Schlagwort(e): Magnetism

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Variational principle of classical density functional theory via Levy’s constrained search method (2011)

Wipsar Sunu Brams Dwandaru and Matthias Schmidt

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-23

Beschreibung: Author(s): Wipsar Sunu Brams Dwandaru and Matthias Schmidt We show that classical density functional theory can be based on the constrained search method [ M. Levy, Proc. Natl. Acad. Sci. USA 76 , 6062 (1979) ]. From the Gibbs inequality one first derives a variational principle for the grand potential as a functional of a trial many-body distribution. This fu... [Phys. Rev. E 83, 061133] Published Wed Jun 22, 2011

Schlagwort(e): Statistical physics

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Multiscale thermodynamics and mechanics of heat (2011)

Miroslav Grmela, Georgy Lebon, and Charles Dubois

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-23

Beschreibung: Author(s): Miroslav Grmela, Georgy Lebon, and Charles Dubois Heat transfer is investigated on three levels of description: Fourier, Cattaneo, and Peierls. The microscopic nature of the heat that becomes important, in particular in nanoscale systems, is characterized by a vector field related to the heat flux on the Cattaneo level and by the phonon distributio... [Phys. Rev. E 83, 061134] Published Wed Jun 22, 2011

Schlagwort(e): Statistical physics

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Exchange interaction between magnetic adatoms on surfaces of noble metals (2011)

E. Simon, B. Újfalussy, B. Lazarovits, A. Szilva, L. Szunyogh, and G. M. Stocks

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-24

Beschreibung: Author(s): E. Simon, B. Újfalussy, B. Lazarovits, A. Szilva, L. Szunyogh, and G. M. Stocks We present first-principles calculations of the exchange interactions between magnetic impurities deposited on (001), (110), and (111) surfaces of Cu and Au and analyze them, in particular, in the asymptotic regime. For the (110) and the (111) surfaces, we demonstrate that the interaction shows an o... [Phys. Rev. B 83, 224416] Published Thu Jun 23, 2011

Schlagwort(e): Magnetism

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Semiclassical approach to electron spin resonance in quantum spin systems (2011)

Shunsuke C. Furuya, Masaki Oshikawa, and Ian Affleck

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-24

Beschreibung: Author(s): Shunsuke C. Furuya, Masaki Oshikawa, and Ian Affleck We develop a semiclassical approximation to electron spin resonance in quantum spin systems, based on the rotor or nonlinear σ model. The classical time evolution is studied using molecular dynamics while random initial conditions are sampled using classical Monte Carlo methods. Although the approxi... [Phys. Rev. B 83, 224417] Published Thu Jun 23, 2011

Schlagwort(e): Magnetism

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Influence of crystallite size and temperature on the antiferromagnetic helices of terbium and holmium metal (2011)

A. Michels, J.-P. Bick, R. Birringer, A. Ferdinand, J. Baller, R. Sanctuary, S. Philippi, D. Lott, S. Balog, E. Rotenberg, G. Kaindl, and K. M. Döbrich

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-24

Beschreibung: Author(s): A. Michels, J.-P. Bick, R. Birringer, A. Ferdinand, J. Baller, R. Sanctuary, S. Philippi, D. Lott, S. Balog, E. Rotenberg, G. Kaindl, and K. M. Döbrich We report on the results of grain-size and temperature-dependent magnetization, specific-heat, and neutron-scattering experiments on the heavy rare-earth metals terbium and holmium, with particular emphasis on the temperature regions where the helical antiferromagnetic phases exist. In contrast to H... [Phys. Rev. B 83, 224415] Published Thu Jun 23, 2011

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Distribution of the time at which N vicious walkers reach their maximal height (2011)

Joachim Rambeau and Grégory Schehr

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-25

Beschreibung: Author(s): Joachim Rambeau and Grégory Schehr We study the extreme statistics of N nonintersecting Brownian motions (vicious walkers) over a unit time interval in one dimension. Using path-integral techniques we compute exactly the joint distribution of the maximum M and of the time τ M at which this maximum is reached. We focus in particular on... [Phys. Rev. E 83, 061146] Published Fri Jun 24, 2011

Schlagwort(e): Statistical physics

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Nonequilibrium fluctuations for linear diffusion dynamics (2011)

Chulan Kwon, Jae Dong Noh, and Hyunggyu Park

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-25

Beschreibung: Author(s): Chulan Kwon, Jae Dong Noh, and Hyunggyu Park We present the theoretical study on nonequilibrium (NEQ) fluctuations for diffusion dynamics in high dimensions driven by a linear drift force. We consider a general situation in which NEQ is caused by two conditions: (i) drift force not derivable from a potential function, and (ii) diffusion matrix... [Phys. Rev. E 83, 061145] Published Fri Jun 24, 2011

Schlagwort(e): Statistical physics

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Magnetic antivortex-core reversal by rotating magnetic fields (2011)

Thomas Kamionka, Michael Martens, Kang Wei Chou, André Drews, Tolek Tyliszczak, Hermann Stoll, Bartel Van Waeyenberge, and Guido Meier

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-28

Beschreibung: Author(s): Thomas Kamionka, Michael Martens, Kang Wei Chou, André Drews, Tolek Tyliszczak, Hermann Stoll, Bartel Van Waeyenberge, and Guido Meier Magnetic vortices and antivortices are usually observed coexisting in cross-tie walls within ferromagnetic thin films. An antivortex can be isolated by utilizing the shape anisotropy. The isolation offers the possibility to investigate its fundamental dynamics as a two-dimensional oscillator in a co... [Phys. Rev. B 83, 224422] Published Mon Jun 27, 2011

Schlagwort(e): Magnetism

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Comment on “Transition from Bose glass to a condensate of triplons in Tl_{1–x}K_{x}CuCl_{3}” (2011)

A. Zheludev and D. Hüvonen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-28

Beschreibung: Author(s): A. Zheludev and D. Hüvonen We argue that the interpretation of the calorimetric data for disordered quantum antiferromagnets Tl 1– x K x CuCl 3 in terms of Bose glass physics by F. Yamada et al. in [Phys. Rev. B 83 , 020409(R) (2011) ] is not unambiguous. A consistent analysis shows no difference in the crossover critical index for t... [Phys. Rev. B 83, 216401] Published Mon Jun 27, 2011

Schlagwort(e): Magnetism

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Superspin glass originating from dipolar interaction with controlled interparticle distance among γ-Fe_{2}O_{3} nanoparticles with silica shells (2011)

Kosuke Hiroi, Katsuyoshi Komatsu, and Tetsuya Sato

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-29

Beschreibung: Author(s): Kosuke Hiroi, Katsuyoshi Komatsu, and Tetsuya Sato γ-Fe 2 O 3 /SiO 2 core-shell nanoparticles with different shell thicknesses were prepared to elucidate the condition for superspin-glass (SSG) dynamics. As the shell thickness decreases, the contribution of interparticle dipolar interaction becomes apparent in the magnetic dynamics of nanoparticle assemb... [Phys. Rev. B 83, 224423] Published Tue Jun 28, 2011

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Frequency adaptation in controlled stochastic resonance utilizing delayed feedback method: Two-pole approximation for response function (2011)

Hiroki Tutu

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-08

Beschreibung: Author(s): Hiroki Tutu Stochastic resonance (SR) enhanced by time-delayed feedback control is studied. The system in the absence of control is described by a Langevin equation for a bistable system, and possesses a usual SR response. The control with the feedback loop, the delay time of which equals to one-half of the per... [Phys. Rev. E 83, 061106] Published Tue Jun 07, 2011

Schlagwort(e): Statistical physics

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First- and second-order wetting transitions in confined Ising films in the presence of nonmagnetic impurities: A Monte Carlo simulation study (2011)

S. M. Cotes and E. V. Albano

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-07

Beschreibung: Author(s): S. M. Cotes and E. V. Albano In this work, we present the results of a systematic exploration of the effect caused by the introduction of nonmagnetic impurities (or defects) on the stabilization of the interface between two magnetic domains of opposite magnetic orientation. Those defects are simulated as spin vacancies along th... [Phys. Rev. E 83, 061105] Published Mon Jun 06, 2011

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Critical temperatures of the three- and four-state Potts models on the kagome lattice (2011)

Seung Ki Baek, Harri Mäkelä, Petter Minnhagen, and Beom Jun Kim

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-07

Beschreibung: Author(s): Seung Ki Baek, Harri Mäkelä, Petter Minnhagen, and Beom Jun Kim The value of the internal energy per spin is independent of the strip width for a certain class of spin systems on two-dimensional infinite strips. It is verified that the Ising model on the kagome lattice belongs to this class through an exact transfer-matrix calculation of the internal energy for ... [Phys. Rev. E 83, 061104] Published Mon Jun 06, 2011

Schlagwort(e): Statistical physics

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Smoothly varying hopping rates in driven flow with exclusion (2011)

R. B. Stinchcombe and S. L. A. de Queiroz

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-14

Beschreibung: Author(s): R. B. Stinchcombe and S. L. A. de Queiroz We consider the one-dimensional totally asymmetric simple exclusion process (TASEP) with position-dependent hopping rates. The problem is solved, in a mean-field adiabatic approximation, for a general (smooth) form of spatial rate variation. Numerical simulations of systems with hopping rates varyin... [Phys. Rev. E 83, 061113] Published Mon Jun 13, 2011

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Energy dissipation via coupling with a finite chaotic environment (2011)

M. A. Marchiori and M. A. M. de Aguiar

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-14

Beschreibung: Author(s): M. A. Marchiori and M. A. M. de Aguiar We study the flow of energy between a harmonic oscillator (HO) and an external environment consisting of N two-degrees-of-freedom nonlinear oscillators, ranging from integrable to chaotic according to a control parameter. The coupling between the HO and the environment is bilinear in the coordinates... [Phys. Rev. E 83, 061112] Published Mon Jun 13, 2011

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Entropic equation of state and scaling functions near the critical point in uncorrelated scale-free networks (2011)

C. von Ferber, R. Folk, Yu. Holovatch, R. Kenna, and V. Palchykov

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-14

Beschreibung: Author(s): C. von Ferber, R. Folk, Yu. Holovatch, R. Kenna, and V. Palchykov We analyze the entropic equation of state for a many-particle interacting system in a scale-free network. The analysis is performed in terms of scaling functions, which are of fundamental interest in the theory of critical phenomena and have previously been theoretically and experimentally explored ... [Phys. Rev. E 83, 061114] Published Mon Jun 13, 2011

Schlagwort(e): Statistical physics

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Diffusive behavior of a greedy traveling salesman (2011)

Adam Lipowski and Dorota Lipowska

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-14

Beschreibung: Author(s): Adam Lipowski and Dorota Lipowska Using Monte Carlo simulations we examine the diffusive properties of the greedy algorithm in the d -dimensional traveling salesman problem. Our results show that for d =3 and 4 the average squared distance from the origin 〈 r 2 〉 is proportional to the number of steps t . In the d =2 case such a scaling is... [Phys. Rev. E 83, 061115] Published Mon Jun 13, 2011

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Frequency-resonance-enhanced vibrational resonance in bistable systems (2011)

Chenggui Yao, Yan Liu, and Meng Zhan

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-17

Beschreibung: Author(s): Chenggui Yao, Yan Liu, and Meng Zhan The dynamics in an overdamped bistable system subject to the action of two periodic forces (assuming their frequencies are ω and Ω , and amplitudes are A and B , respectively) is studied. For the usual vibrational resonance, the nonmonotonic dependence of signal output of the low frequency ω on the ch... [Phys. Rev. E 83, 061122] Published Thu Jun 16, 2011

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Disappearance of the de Almeida-Thouless line in six dimensions (2011)

M. A. Moore and A. J. Bray

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-21

Beschreibung: Author(s): M. A. Moore and A. J. Bray We show that the Almeida-Thouless line in Ising spin glasses vanishes when their dimension d →6 + as h AT 2 / T c 2 = C ( d -6) 4 (1- T / T c ) d /2-1 , where C is a constant of order unity. It is shown that replica symmetry breaking also stops as d →6 + . Equivalent results that could be checked by simulations are given for... [Phys. Rev. B 83, 224408] Published Mon Jun 20, 2011

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Threshold-induced phase transition in kinetic exchange models (2011)

Asim Ghosh, Urna Basu, Anirban Chakraborti, and Bikas K. Chakrabarti

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-21

Beschreibung: Author(s): Asim Ghosh, Urna Basu, Anirban Chakraborti, and Bikas K. Chakrabarti We study an ideal-gas-like model where the particles exchange energy stochastically, through energy-conserving scattering processes, which take place if and only if at least one of the two particles has energy below a certain energy threshold (interactions are initiated by such low-energy particles)... [Phys. Rev. E 83, 061130] Published Mon Jun 20, 2011

Schlagwort(e): Statistical physics

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Z_{2} spin liquids in the S=1/2 Heisenberg model on the kagome lattice: A projective symmetry-group study of Schwinger fermion mean-field states (2011)

Yuan-Ming Lu, Ying Ran, and Patrick A. Lee

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-23

Beschreibung: Author(s): Yuan-Ming Lu, Ying Ran, and Patrick A. Lee Due to strong geometric frustration and quantum fluctuation, the S =1/2 quantum Heisenberg antiferromagnet on the kagome lattice has long been considered as an ideal platform to realize a spin liquid (SL), a phase exhibiting fractionalized excitations without any symmetry breaking. A recent numerical... [Phys. Rev. B 83, 224413] Published Wed Jun 22, 2011

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Slow dynamics and field-induced transitions in a mixed-valence oxide solid solution (2011)

M. Charilaou, J. F. Löffler, and A. U. Gehring

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-23

Beschreibung: Author(s): M. Charilaou, J. F. Löffler, and A. U. Gehring In this study, the spin-glass-like properties of ( x )FeTiO 3 – (1- x )Fe 2 O 3 , with x =0.8 and 0.9, as prominent mixed-valence state solid solution, were investigated by means of ac susceptibility and dc magnetization measurements. Dynamic ac susceptibility indicates freezing at finite temperature T f , obeyi... [Phys. Rev. B 83, 224414] Published Wed Jun 22, 2011

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Thermalization of strongly disordered nonlinear chains (2011)

Tsampikos Kottos and Boris Shapiro

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-23

Beschreibung: Author(s): Tsampikos Kottos and Boris Shapiro Thermalization of systems described by the discrete nonlinear Schrödinger equation, in the strong disorder limit, is investigated both theoretically and numerically. We show that introducing correlations in the disorder potential, while keeping the “effective” disorder fixed (as measured by the loca... [Phys. Rev. E 83, 062103] Published Wed Jun 22, 2011

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Nonanalyticities of thermodynamic functions in finite noninteracting Bose gases within an exact microcanonical ensemble (2011)

Hui-yi Tang and Yong-li Ma

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-24

Beschreibung: Author(s): Hui-yi Tang and Yong-li Ma Within an exact microcanonical (MC) ensemble, we study the nonanalyticities of thermodynamic functions research in finite noninteracting Bose gases in traps. The results show that there exists a rich oscillatory behavior of MC thermodynamical quantities as a function of a system’s total energy E (e.... [Phys. Rev. E 83, 061135] Published Thu Jun 23, 2011

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Hysteresis in the antiferromagnetic random-field Ising model at zero temperature (2011)

Lobisor Kurbah and Prabodh Shukla

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-24

Beschreibung: Author(s): Lobisor Kurbah and Prabodh Shukla We study hysteresis in antiferromagnetic random-field Ising model at zero temperature. The external field is cycled adiabatically between - ∞ and ∞ . Two different distributions of the random field are considered: (i) a uniform distribution of width 2 Δ centered at the origin and (ii) a Gaussian distri... [Phys. Rev. E 83, 061136] Published Thu Jun 23, 2011

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Perturbation theory for fractional Brownian motion in presence of absorbing boundaries (2011)

Kay Jörg Wiese, Satya N. Majumdar, and Alberto Rosso

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-25

Beschreibung: Author(s): Kay Jörg Wiese, Satya N. Majumdar, and Alberto Rosso Fractional Brownian motion is a Gaussian process x ( t ) with zero mean and two-time correlations 〈 x ( t 1 ) x ( t 2 )〉= D ( t 1 2 H + t 2 2 H -| t 1 - t 2 | 2 H ) , where H , with 0〈 H 〈1 , is called the Hurst exponent. For H =1/2 , x ( t ) is a Brownian motion, while for H ≠1/2 , x ( t ) is a non-Markovian process. Here we study x ( t ) in p... [Phys. Rev. E 83, 061141] Published Fri Jun 24, 2011

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Stochastic thermodynamics for delayed Langevin systems (2011)

Huijun Jiang, Tiejun Xiao, and Zhonghuai Hou

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-25

Beschreibung: Author(s): Huijun Jiang, Tiejun Xiao, and Zhonghuai Hou We discuss stochastic thermodynamics (ST) for delayed Langevin systems in this paper. By using the general principles of ST, the first-law-like energy balance and trajectory-dependent entropy s ( t ) can be well defined in a way that is similar to that in a system without delay. Because the presence of... [Phys. Rev. E 83, 061144] Published Fri Jun 24, 2011

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Spin gap of the three-leg S=3/2 Heisenberg tube (2011)

S. Nishimoto, Y. Fuji, and Y. Ohta

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-29

Beschreibung: Author(s): S. Nishimoto, Y. Fuji, and Y. Ohta The ground-state properties of the three-leg S =3/2 straight Heisenberg tube are studied using the density-matrix renormalization group method. We find that the spin-excitation gap associated with a spontaneous dimerization opens for the whole coupling regime, as seen in the three-leg S =1/2 straight ... [Phys. Rev. B 83, 224425] Published Tue Jun 28, 2011

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Origin of in-plane uniaxial magnetic anisotropy in CoFeB amorphous ferromagnetic thin films (2011)

A. T. Hindmarch, A. W. Rushforth, R. P. Campion, C. H. Marrows, and B. L. Gallagher

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-29

Beschreibung: Author(s): A. T. Hindmarch, A. W. Rushforth, R. P. Campion, C. H. Marrows, and B. L. Gallagher Describing the origin of uniaxial magnetic anisotropy (UMA) is generally problematic in systems other than single crystals. We demonstrate an in-plane UMA in amorphous CoFeB films on GaAs(001) which has the expected symmetry of the interface anisotropy in ferromagnetic films on GaAs(001), but streng... [Phys. Rev. B 83, 212404] Published Tue Jun 28, 2011

Schlagwort(e): Magnetism

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Critical behavior and correlations on scale-free small-world networks: Application to network design (2011)

M. Ostilli, A. L. Ferreira, and J. F. F. Mendes

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-29

Beschreibung: Author(s): M. Ostilli, A. L. Ferreira, and J. F. F. Mendes We analyze critical phenomena on networks generated as the union of hidden variable models (networks with any desired degree sequence) with arbitrary graphs. The resulting networks are general small worlds similar to those à la Watts and Strogatz, but with a heterogeneous degree distribution. We pro... [Phys. Rev. E 83, 061149] Published Tue Jun 28, 2011

Schlagwort(e): Statistical physics

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Traffic-light boundary in the deterministic Nagel-Schreckenberg model (2011)

Ning Jia and Shoufeng Ma

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-29

Beschreibung: Author(s): Ning Jia and Shoufeng Ma The characteristics of the deterministic Nagel–Schreckenberg model with traffic-light boundary conditions are investigated and elucidated in a mostly theoretically way. First, precise analytical results of the outflow are obtained for cases in which the duration of the red phase is longer than one s... [Phys. Rev. E 83, 061150] Published Tue Jun 28, 2011

Schlagwort(e): Statistical physics

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Phase transitions in the one-dimensional long-range diluted Heisenberg spin glass (2011)

Auditya Sharma and A. P. Young

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-10

Beschreibung: Author(s): Auditya Sharma and A. P. Young We use Monte Carlo simulations to study the one-dimensional long-range diluted Heisenberg spin glass with interactions that fall as a power σ of the distance. Varying the power is argued to be equivalent to varying the space dimension of a short-range model. We are therefore able to study both the m... [Phys. Rev. B 83, 214405] Published Thu Jun 09, 2011

Schlagwort(e): Magnetism

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Dzyaloshinskii-Moriya interaction and spin reorientation transition in the frustrated kagome lattice antiferromagnet (2011)

K. Matan, B. M. Bartlett, J. S. Helton, V. Sikolenko, S. Mat’aš, K. Prokeš, Y. Chen, J. W. Lynn, D. Grohol, T. J. Sato, M. Tokunaga, D. G. Nocera, and Y. S. Lee

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-10

Beschreibung: Author(s): K. Matan, B. M. Bartlett, J. S. Helton, V. Sikolenko, S. Mat’aš, K. Prokeš, Y. Chen, J. W. Lynn, D. Grohol, T. J. Sato, M. Tokunaga, D. G. Nocera, and Y. S. Lee Magnetization, specific heat, and neutron scattering measurements were performed to study a magnetic transition in jarosite, a spin- 5/2 kagome lattice antiferromagnet. When a magnetic field is applied perpendicular to the kagome plane, magnetizations in the ordered state show a sudden increase at a ... [Phys. Rev. B 83, 214406] Published Thu Jun 09, 2011

Schlagwort(e): Magnetism

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Mixed-valence behavior and strong correlation effects of metal phthalocyanines adsorbed on metals (2011)

S. Stepanow, P. S. Miedema, A. Mugarza, G. Ceballos, P. Moras, J. C. Cezar, C. Carbone, F. M. F. de Groot, and P. Gambardella

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-10

Beschreibung: Author(s): S. Stepanow, P. S. Miedema, A. Mugarza, G. Ceballos, P. Moras, J. C. Cezar, C. Carbone, F. M. F. de Groot, and P. Gambardella We investigate the hierarchy of local correlation and hybridization effects in metal-organic molecules adsorbed on metals. Using x-ray magnetic circular dichroism and ligand field multiplet calculations, we demonstrate that the 3 d electronic ground state of monolayer metal-phthalocyanine (CoPc, FePc... [Phys. Rev. B 83, 220401] Published Thu Jun 09, 2011

Schlagwort(e): Magnetism

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Entangled spin-orbital phases in the bilayer Kugel-Khomskii model (2011)

Wojciech Brzezicki and Andrzej M. Oleś

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-11

Beschreibung: Author(s): Wojciech Brzezicki and Andrzej M. Oleś We derive the Kugel-Khomskii spin-orbital model for a bilayer and investigate its phase diagram depending on Hund’s exchange J H and the e g orbital splitting E z . In the (classical) mean-field approach with on-site spin 〈 S i z 〉 and orbital 〈 τ i z 〉 order parameters and factorized spin-and-orbital degrees o... [Phys. Rev. B 83, 214408] Published Fri Jun 10, 2011

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Strong isotopic effect in the electron-mediated nuclear-nuclear interaction in solids (2011)

Frédéric Mentink-Vigier, Laurent Binet, and Didier Gourier

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-11

Beschreibung: Author(s): Frédéric Mentink-Vigier, Laurent Binet, and Didier Gourier We studied the nuclear-nuclear spin interaction mediated by an unpaired electron spin, focusing on an isotopic effect by electron nuclear double resonance (ENDOR) spectroscopy. We investigated a linear cluster Ga-Ti 3+ -Ga in titanium-doped gallium oxyde β -Ga 2 O 3 , whereby the unpaired electron spin den... [Phys. Rev. B 83, 214409] Published Fri Jun 10, 2011

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Thermodynamics of the frustrated one-dimensional spin-1/2 Heisenberg ferromagnet in a magnetic field (2011)

M. Härtel, J. Richter, and D. Ihle

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-14

Beschreibung: Author(s): M. Härtel, J. Richter, and D. Ihle We calculate the low-temperature thermodynamic quantities (magnetization, correlation functions, transverse and longitudinal correlation lengths, spin susceptibility, and specific heat) of the frustrated one-dimensional spin-half J 1 - J 2 Heisenberg ferromagnet, i.e., for J 2 〈0.25| J 1 | , in an external... [Phys. Rev. B 83, 214412] Published Mon Jun 13, 2011

Schlagwort(e): Magnetism

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Effects of interfacial noncollinear magnetic structures on spin-dependent conductance in Co_{2}MnSi/MgO/Co_{2}MnSi magnetic tunnel junctions: A first-principles study (2011)

Yoshio Miura, Kazutaka Abe, and Masafumi Shirai

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-14

Beschreibung: Author(s): Yoshio Miura, Kazutaka Abe, and Masafumi Shirai We investigate the effects of spin-flip scattering on tunneling magnetoresistance (TMR) in magnetic tunnel junctions (MTJs) with half-metallic Co 2 MnSi (CMS) and MgO on the basis of the first-principles calculations. We found that noncollinear magnetic structures of interfacial Co spin moments result... [Phys. Rev. B 83, 214411] Published Mon Jun 13, 2011

Schlagwort(e): Magnetism

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Overcoming the spin-multiplicity limit of entropy by means of lattice degrees of freedom: A minimal model (2011)

T. Mukherjee, S. Michalski, R. Skomski, D. J. Sellmyer, and Ch. Binek

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-14

Beschreibung: Author(s): T. Mukherjee, S. Michalski, R. Skomski, D. J. Sellmyer, and Ch. Binek The discovery of the giant magnetocaloric effect with isothermal field-induced entropy change beyond the spin-multiplicity limit gave rise to some indistinctness in the literature regarding the applicability of fundamental thermodynamics in data analysis. Those misleading interpretations concerning,... [Phys. Rev. B 83, 214413] Published Mon Jun 13, 2011

Schlagwort(e): Magnetism

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Exceptionally strong magnetism in the 4d perovskites RTcO_{3} (R=Ca, Sr, Ba) (2011)

C. Franchini, T. Archer, Jiangang He, Xing-Qiu Chen, A. Filippetti, and S. Sanvito

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-14

Beschreibung: Author(s): C. Franchini, T. Archer, Jiangang He, Xing-Qiu Chen, A. Filippetti, and S. Sanvito The evolution of the magnetic ordering temperature of the 4 d 3 perovskites R TcO 3 ( R =Ca , Sr, Ba) and its relation with its electronic and structural properties has been studied by means of hybrid density functional theory and Monte Carlo simulations. When compared to the most widely studied 3 d perovsk... [Phys. Rev. B 83, 220402] Published Mon Jun 13, 2011

Schlagwort(e): Magnetism

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Garnet superlattice as a transparent above-room-temperature polar magnet (2011)

Y. Krockenberger, J. S. Lee, D. Okuyama, H. Nakao, Y. Murakami, M. Kawasaki, and Y. Tokura

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-15

Beschreibung: Author(s): Y. Krockenberger, J. S. Lee, D. Okuyama, H. Nakao, Y. Murakami, M. Kawasaki, and Y. Tokura The interface magnetic state in the garnet superlattices has been investigated by measuring the magnetization-induced second harmonic generation. Among the superlattice films being composed of sequentially stacked two or three different compositions of garnet layers including a magnetic yttrium iron... [Phys. Rev. B 83, 214414] Published Tue Jun 14, 2011

Schlagwort(e): Magnetism

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Interference in disordered systems: A particle in a complex random landscape (2011)

Alexander Dobrinevski, Pierre Le Doussal, and Kay Jörg Wiese

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-15

Beschreibung: Author(s): Alexander Dobrinevski, Pierre Le Doussal, and Kay Jörg Wiese We consider a particle in one dimension submitted to amplitude and phase disorder. It can be mapped onto the complex Burgers equation, and provides a toy model for problems with interplay of interferences and disorder, such as the Nguyen-Spivak-Shklovskii model of hopping conductivity in disordered ... [Phys. Rev. E 83, 061116] Published Tue Jun 14, 2011

Schlagwort(e): Statistical physics

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Time-averaged quadratic functionals of a Gaussian process (2011)

Denis S. Grebenkov

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-15

Beschreibung: Author(s): Denis S. Grebenkov The characterization of a stochastic process from its single random realization is a challenging problem for most single-particle tracking techniques which survey an individual trajectory of a tracer in a complex or viscoelastic medium. We consider two quadratic functionals of the trajectory: the ti... [Phys. Rev. E 83, 061117] Published Tue Jun 14, 2011

Schlagwort(e): Statistical physics

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Antiferromagnetic order in MnO spherical nanoparticles (2011)

C. H. Wang, S. N. Baker, M. D. Lumsden, S. E. Nagler, W. T. Heller, G. A. Baker, P. D. Deen, L. M. D. Cranswick, Y. Su, and A. D. Christianson

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-16

Beschreibung: Author(s): C. H. Wang, S. N. Baker, M. D. Lumsden, S. E. Nagler, W. T. Heller, G. A. Baker, P. D. Deen, L. M. D. Cranswick, Y. Su, and A. D. Christianson We have performed unpolarized and polarized neutron diffraction experiments on monodisperse 8- and 13-nm antiferromagnetic MnO nanoparticles. For the 8-nm sample, the antiferromagnetic transition temperature T N (114 K) is suppressed compared to that in the bulk material (119 K), while for the 13-nm ... [Phys. Rev. B 83, 214418] Published Wed Jun 15, 2011

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High-field magnetization of Ho_{2}Fe_{17} (2011)

Y. Skourski, M. D. Kuz’min, K. P. Skokov, A. V. Andreev, and J. Wosnitza

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-16

Beschreibung: Author(s): Y. Skourski, M. D. Kuz’min, K. P. Skokov, A. V. Andreev, and J. Wosnitza The magnetization of a Ho 2 Fe 17 single crystal has been measured along the principal crystallographic directions in pulsed magnetic fields up to 60 T. Stepwise discontinuities in the magnetization occur at 45 and 55 T along the [120] and [100] directions, respectively. The data allowed us to deduce t... [Phys. Rev. B 83, 214420] Published Wed Jun 15, 2011

Schlagwort(e): Magnetism

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Microscopic origin of magnetic anisotropy in martensitic Ni_{2}MnGa (2011)

P. Klaer, T. Eichhorn, G. Jakob, and H. J. Elmers

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-16

Beschreibung: Author(s): P. Klaer, T. Eichhorn, G. Jakob, and H. J. Elmers The microscopic origin of magnetic anisotropy in the shape memory alloy Ni 2 MnGa is investigated by means of x-ray magnetic circular dichroism in transmission mode. Field- and angle-dependent dichroism spectra of epitaxial Ni 2 MnGa(101)/MgO(001) films reveal pronounced differences for magnetization al... [Phys. Rev. B 83, 214419] Published Wed Jun 15, 2011

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Antiferromagnetic superexchange via 3d states of titanium in EuTiO_{3} as seen from hybrid Hartree-Fock density functional calculations (2011)

Hirofumi Akamatsu, Yu Kumagai, Fumiyasu Oba, Koji Fujita, Hideo Murakami, Katsuhisa Tanaka, and Isao Tanaka

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Hirofumi Akamatsu, Yu Kumagai, Fumiyasu Oba, Koji Fujita, Hideo Murakami, Katsuhisa Tanaka, and Isao Tanaka A superexchange mechanism between Eu 2+ 4 f spins via the 3 d states of nonmagnetic Ti 4+ ions is proposed through first-principles calculations based on a hybrid Hartree-Fock density functional approach to explain G -type antiferromagnetism in EuTiO 3 . This mechanism is supported by systematic calculatio... [Phys. Rev. B 83, 214421] Published Wed Jun 15, 2011

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X-ray imaging of vortex cores in confined magnetic structures (2011)

Peter Fischer, Mi-Young Im, Shinya Kasai, Keisuke Yamada, Teruo Ono, and André Thiaville

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Peter Fischer, Mi-Young Im, Shinya Kasai, Keisuke Yamada, Teruo Ono, and André Thiaville Cores of magnetic vortices in micron-sized NiFe disk structures, with thicknesses between 150 and 50 nm, were imaged and analyzed by high-resolution magnetic soft x-ray microscopy. A decrease of the vortex-core radius was observed from approximately 38 to 18 nm with decreasing disk thickness. By com... [Phys. Rev. B 83, 212402] Published Wed Jun 15, 2011

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Product of Ginibre matrices: Fuss-Catalan and Raney distributions (2011)

Karol A. Penson and Karol Życzkowski

American Physical Society (APS)

In: Physical Review E

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Beschreibung: Author(s): Karol A. Penson and Karol Życzkowski Squared singular values of a product of s square random Ginibre matrices are asymptotically characterized by probability distributions P s ( x ) , such that their moments are equal to the Fuss–Catalan numbers of order s . We find a representation of the Fuss-Catalan distributions P s ( x ) in terms of a combi... [Phys. Rev. E 83, 061118] Published Wed Jun 15, 2011

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Prescription-induced jump distributions in multiplicative Poisson processes (2011)

Samir Suweis, Amilcare Porporato, Andrea Rinaldo, and Amos Maritan

American Physical Society (APS)

In: Physical Review E

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Beschreibung: Author(s): Samir Suweis, Amilcare Porporato, Andrea Rinaldo, and Amos Maritan Generalized Langevin equations (GLE) with multiplicative white Poisson noise pose the usual prescription dilemma leading to different evolution equations (master equations) for the probability distribution. Contrary to the case of multiplicative Gaussian white noise, the Stratonovich prescription do... [Phys. Rev. E 83, 061119] Published Wed Jun 15, 2011

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Modeling Maxwell’s demon with a microcanonical Szilard engine (2011)

Suriyanarayanan Vaikuntanathan and Christopher Jarzynski

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-16

Beschreibung: Author(s): Suriyanarayanan Vaikuntanathan and Christopher Jarzynski Following recent work by Marathe and Parrondo [Phys. Rev. Lett. 104 , 245704 (2010)] , we construct a classical Hamiltonian system whose energy is reduced during the adiabatic cycling of external parameters when initial conditions are sampled microcanonically. Combining our system with a device that m... [Phys. Rev. E 83, 061120] Published Wed Jun 15, 2011

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Ultraslow convergence to ergodicity in transient subdiffusion (2011)

Tomoshige Miyaguchi and Takuma Akimoto

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-16

Beschreibung: Author(s): Tomoshige Miyaguchi and Takuma Akimoto We investigate continuous time random walks with truncated α -stable trapping times. We prove distributional ergodicity for a class of observables; namely, the time-averaged observables follow the probability density function called the Mittag-Leffler distribution. This distributional ergodic behavio... [Phys. Rev. E 83, 062101] Published Wed Jun 15, 2011

Schlagwort(e): Statistical physics

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Thermal diode from two-dimensional asymmetrical Ising lattices (2011)

Lei Wang (王雷) and Baowen Li (李保文)

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-18

Beschreibung: Author(s): Lei Wang (王雷) and Baowen Li (李保文) Two-dimensional asymmetrical Ising models consisting of two weakly coupled dissimilar segments, coupled to heat baths with different temperatures at the two ends, are studied by Monte Carlo simulations. The heat rectifying effect, namely asymmetric heat conduction, is clearly observed. The underlyin... [Phys. Rev. E 83, 061128] Published Fri Jun 17, 2011

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Anharmonic effects in magnetoelastic chains (2011)

D. C. Cabra, C. J. Gazza, C. A. Lamas, and H. D. Rosales

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-21

Beschreibung: Author(s): D. C. Cabra, C. J. Gazza, C. A. Lamas, and H. D. Rosales We describe a new mechanism leading to the formation of rational magnetization plateau phases, which is mainly due to the anharmonic spin-phonon coupling. This anharmonicity produces plateaux in the magnetization curve at unexpected values of the magnetization without explicit magnetic frustration i... [Phys. Rev. B 83, 224406] Published Mon Jun 20, 2011

Schlagwort(e): Magnetism

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Spatial manipulation of magnetic damping in ferromagnetic-antiferromagnetic films by ion irradiation (2011)

Jeffrey McCord, Thomas Strache, Ingolf Mönch, Roland Mattheis, and Jürgen Fassbender

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-21

Beschreibung: Author(s): Jeffrey McCord, Thomas Strache, Ingolf Mönch, Roland Mattheis, and Jürgen Fassbender The spatial manipulation of the effective magnetic damping parameter in ferromagnetic-antiferromagnetic-ferromagnetic film systems is shown. By applying ultrathin antiferromagnetic layers in Ni 81 Fe 19 /IrMn/Ni 81 Fe 19 sandwich structures in combination with low fluence Ni-ion irradiation, a lateral cont... [Phys. Rev. B 83, 224407] Published Mon Jun 20, 2011

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Magnetic fluctuations and correlations in MnSi: Evidence for a chiral skyrmion spin liquid phase (2011)

C. Pappas, E. Lelièvre-Berna, P. Bentley, P. Falus, P. Fouquet, and B. Farago

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-21

Beschreibung: Author(s): C. Pappas, E. Lelièvre-Berna, P. Bentley, P. Falus, P. Fouquet, and B. Farago We present a comprehensive analysis of high-resolution neutron scattering data involving neutron spin echo spectroscopy and spherical polarimetry, which confirm the first-order nature of the helical transition in MnSi. The experiments reveal the existence of a totally chiral dynamic phase in a very ... [Phys. Rev. B 83, 224405] Published Mon Jun 20, 2011

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Evidence of three-dimensional Ising ferromagnetism in the A-site-ordered perovskite CaCu_{3}Ge_{4}O_{12} (2011)

J.-G. Cheng, J.-S. Zhou, J. B. Goodenough, Y. T. Su, and Y. Sui

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-24

Beschreibung: Author(s): J.-G. Cheng, J.-S. Zhou, J. B. Goodenough, Y. T. Su, and Y. Sui The A -site-ordered perovskite CaCu 3 Ge 4 O 12 synthesized under high pressure undergoes ferromagnetic spin ordering below T c ≈ 12 K. The critical exponents have been determined from isotherms of magnetization across T c via an iteration process and the Kouvel-Fisher method as well as from specific heat. ... [Phys. Rev. B 83, 212403] Published Thu Jun 23, 2011

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Brownian walkers within subdiffusing territorial boundaries (2011)

L. Giuggioli, J. R. Potts, and S. Harris

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-24

Beschreibung: Author(s): L. Giuggioli, J. R. Potts, and S. Harris Inspired by the collective phenomenon of territorial emergence, whereby animals move and interact through the scent marks they deposit, we study the dynamics of a 1D Brownian walker in a random environment consisting of confining boundaries that are themselves diffusing anomalously. We show how to r... [Phys. Rev. E 83, 061138] Published Thu Jun 23, 2011

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Bose-Einstein condensation in the infinitely ramified star and wheel graphs (2011)

E. J. G. G. Vidal, R. P. A Lima, and M. L. Lyra

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-24

Beschreibung: Author(s): E. J. G. G. Vidal, R. P. A Lima, and M. L. Lyra In this work, we provide exact solutions for the ideal boson lattice gas on the infinitely ramified star and wheel graphs. Within a tight-binding description, we show that Bose-Einstein condensation (BEC) takes place at a finite temperature after a proper rescaling of the hoping integral ɛ connectin... [Phys. Rev. E 83, 061137] Published Thu Jun 23, 2011

Schlagwort(e): Statistical physics

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Anomalous diffusion and weak nonergodicity (2011)

A. Fuliński

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-25

Beschreibung: Author(s): A. Fuliński Ergodic behavior of the class of G processes G ( t )=∫ t m t du K ( t , u ) ξ ( u )-∫ t m 0 du K (0, u ) ξ ( u ) , 〈 ξ ( t )〉=0 , 〈 ξ ( t ) ξ ( s )〉= ϕ (| t - s |) is examined. Ergodicproperties are only G extensions of normal diffusion ( K =1 ) and of Mandelbrot-Van Ness fractional diffusion [ K ( t , u )= K ( t - u ) , t m →- ∞ ]. Any deviation from these two typ... [Phys. Rev. E 83, 061140] Published Fri Jun 24, 2011

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Multinomial diffusion equation (2011)

Ariel Balter and Alexandre M. Tartakovsky

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-25

Beschreibung: Author(s): Ariel Balter and Alexandre M. Tartakovsky We describe a new, microscopic model for diffusion that captures diffusion induced fluctuations at scales where the concept of concentration gives way to discrete particles. We show that in the limit as the number of particles N → ∞ , our model is equivalent to the classical stochastic diffusion equati... [Phys. Rev. E 83, 061143] Published Fri Jun 24, 2011

Schlagwort(e): Statistical physics

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Critical thickness investigation of magnetic properties in exchange-coupled bilayers (2011)

R. L. Rodríguez-Suárez, L. H. Vilela-Leão, T. Bueno, A. B. Oliveira, J. R. L. de Almeida, P. Landeros, S. M. Rezende, and A. Azevedo

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-25

Beschreibung: Author(s): R. L. Rodríguez-Suárez, L. H. Vilela-Leão, T. Bueno, A. B. Oliveira, J. R. L. de Almeida, P. Landeros, S. M. Rezende, and A. Azevedo We present a systematic investigation of the magnetic properties of two series of polycrystalline ferromagnetic-antiferromagnetic bilayers (FM-AF) of Ni 81 Fe 19 (10nm)/Ir 20 Mn 80 ( t AF ) grown by dc magnetron sputtering. One series was grown at an oblique angle of 50° and the other one was grown at 0°. Ferr... [Phys. Rev. B 83, 224418] Published Fri Jun 24, 2011

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Suppression of noise in magnetic layers by a periodic spin torque (2011)

A. Rebei

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-28

Beschreibung: Author(s): A. Rebei The simultaneous effect of thermal noise and time-periodic spin torques on magnetic multilayers are treated in this work. Using two commonly studied magnetic systems with multiple stable states at zero temperature as examples, we show that periodic spin torques can enhance the stability of the syste... [Phys. Rev. E 83, 061148] Published Mon Jun 27, 2011

Schlagwort(e): Statistical physics

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Particle-exchange heat engine working between bosonic and fermionic reservoirs (2011)

Peng Li and Beike Jia

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-28

Beschreibung: Author(s): Peng Li and Beike Jia We propose a mesoscopic particle-exchange heat engine realized via coupled quantum dots. The engine is able to extract work from a bosonic reservoir and can be used as a refrigerator. The electric current is derived from a master-equation method and is readdressed under a thermodynamic context. The ... [Phys. Rev. E 83, 062104] Published Mon Jun 27, 2011

Schlagwort(e): Statistical physics

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Influence of temperature on the gyrotropic eigenmode of magnetic vortices (2011)

Thomas Kamionka, Michael Martens, André Drews, Benjamin Krüger, Ole Albrecht, and Guido Meier

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-29

Beschreibung: Author(s): Thomas Kamionka, Michael Martens, André Drews, Benjamin Krüger, Ole Albrecht, and Guido Meier Magnetic vortices in ferromagnetic thin-film structures can be excited to gyrate resonantly at a characteristic eigenfrequency. The influence of temperature on the gyrotropic eigenfrequency of vortices in micrometer-sized permalloy squares is studied. Ferromagnetic absorption measurements around roo... [Phys. Rev. B 83, 224424] Published Tue Jun 28, 2011

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Quantum Maxwell's demon in thermodynamic cycles (2011)

H. Dong (董辉), D. Z. Xu (徐大智), C. Y. Cai (蔡承韵), and C. P. Sun (孙昌璞)

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-09

Beschreibung: Author(s): H. Dong (董辉), D. Z. Xu (徐大智), C. Y. Cai (蔡承韵), and C. P. Sun (孙昌璞) We study the physical mechanism of Maxwell’s demon (MD), which helps do extra work in thermodynamic cycles with the heat engine. This is exemplified with one molecule confined in an infinitely deep square potential with a movable solid wall. The MD is modeled as a two-level system (TLS) for measurin... [Phys. Rev. E 83, 061108] Published Wed Jun 08, 2011

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Spin-state transitions in CaFeSi_{2}O_{6} and NaFeSi_{2}O_{6} under pressure (2011)

S. V. Streltsov and N. A. Skorikov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-11

Beschreibung: Author(s): S. V. Streltsov and N. A. Skorikov The spin-state transitions in Fe-based clinopyroxenes are predicted and investigated with the use of the band structure calculations within GGA + U approach. The transitions were found to be of first order with critical pressures P c ~40 GPa for CaFeSi 2 O 6 and P c ~60 GPa for NaFeSi 2 O 6 . The spin-state tr... [Phys. Rev. B 83, 214407] Published Fri Jun 10, 2011

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Impact of local lattice distortions on the structural stability of Fe-Pd magnetic shape-memory alloys (2011)

Markus E. Gruner and Peter Entel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-15

Beschreibung: Author(s): Markus E. Gruner and Peter Entel The binding surface of Fe-rich Fe-Pd alloys is explored by means of first-principles calculations in the framework of density functional theory involving unconstrained optimization of the atomic positions within a 108-atom supercell. We find that static displacements arising from geometric optimizat... [Phys. Rev. B 83, 214415] Published Tue Jun 14, 2011

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Pulsating regime of magnetic deflagration in crystals of molecular magnets (2011)

M. Modestov, V. Bychkov, and M. Marklund

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-15

Beschreibung: Author(s): M. Modestov, V. Bychkov, and M. Marklund The stability of a magnetic deflagration front in a media of molecular magnets, such as Mn 12 acetate, is considered. It is demonstrated that stationary deflagration is unstable with respect to one-dimensional perturbations if the energy barrier of the magnets is sufficiently high in comparison with ... [Phys. Rev. B 83, 214417] Published Tue Jun 14, 2011

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Heat transport in quantum spin chains: Relevance of integrability (2011)

Jinshan Wu and Mona Berciu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-15

Beschreibung: Author(s): Jinshan Wu and Mona Berciu We investigate heat transport in various quantum spin chains using the Redfield equation. We find that anomalous heat transport is linked not to the integrability of the Hamiltonian, but to whether it can be mapped to a model of noninteracting fermions. Our results also suggest how seemingly anomalo... [Phys. Rev. B 83, 214416] Published Tue Jun 14, 2011

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Interplay between particle anisotropy and exchange interaction in Fe nanoparticle films (2011)

V. Iannotti, S. Amoruso, G. Ausanio, X. Wang, L. Lanotte, A. C. Barone, G. Margaris, K. N. Trohidou, and D. Fiorani

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-17

Beschreibung: Author(s): V. Iannotti, S. Amoruso, G. Ausanio, X. Wang, L. Lanotte, A. C. Barone, G. Margaris, K. N. Trohidou, and D. Fiorani The magnetic properties of Fe nanoparticles films were investigated by magnetization measurements and Monte Carlo simulations. The films were produced by femtosecond pulsed laser deposition assisted by irradiation of nanoparticles with a nanosecond UV laser pulse, appropriately delayed, during their... [Phys. Rev. B 83, 214422] Published Thu Jun 16, 2011

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Spin Seebeck effect in thin films of the Heusler compound Co_{2}MnSi (2011)

S. Bosu, Y. Sakuraba, K. Uchida, K. Saito, T. Ota, E. Saitoh, and K. Takanashi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-17

Beschreibung: Author(s): S. Bosu, Y. Sakuraba, K. Uchida, K. Saito, T. Ota, E. Saitoh, and K. Takanashi The recently discovered spin Seebeck effect (SSE) which generates spin voltage due to a temperature gradient in ferromagnets, was systematically studied in half-metallic Heusler compound Co 2 MnSi (CMS)/Pt thin films to investigate the effect of spin polarization of ferromagnetic layer on SSE. An epit... [Phys. Rev. B 83, 224401] Published Thu Jun 16, 2011

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Stochastic resonance in periodic potentials (2011)

S. Saikia, A. M. Jayannavar, and Mangal C. Mahato

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-17

Beschreibung: Author(s): S. Saikia, A. M. Jayannavar, and Mangal C. Mahato The phenomenon of stochastic resonance (SR) is known to occur mostly in bistable systems. However, the question of the occurrence of SR in periodic potential systems has not been resolved conclusively. Our present numerical work shows that the periodic potential system indeed exhibits SR in the high... [Phys. Rev. E 83, 061121] Published Thu Jun 16, 2011

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Directed excitation transfer in vibrating chains by external fields (2011)

Oliver Mülken and Maximilian Bauer

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-17

Beschreibung: Author(s): Oliver Mülken and Maximilian Bauer We study the coherent dynamics of excitations on vibrating chains. By applying an external field and matching the field strength with the oscillation frequency of the chain it is possible to obtain an (average) transport of an initial Gaussian wave packet. We distinguish between a uniform oscillatio... [Phys. Rev. E 83, 061123] Published Thu Jun 16, 2011

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Critical interfaces and duality in the Ashkin-Teller model (2011)

Marco Picco and Raoul Santachiara

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-17

Beschreibung: Author(s): Marco Picco and Raoul Santachiara We report on the numerical measures on different spin interfaces and Fortuin-Kasteleyn (FK) cluster boundaries in the Askhin-Teller (AT) model. For a general point on the AT critical line, we find that the fractal dimension of a generic spin cluster interface can take one of four different possible ... [Phys. Rev. E 83, 061124] Published Thu Jun 16, 2011

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Nonergodic solutions of the generalized Langevin equation (2011)

A. V. Plyukhin

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2011-06-17

Beschreibung: Author(s): A. V. Plyukhin It is known that in the regime of superlinear diffusion, characterized by zero integral friction (vanishing integral of the memory function), the generalized Langevin equation may have nonergodic solutions that do not relax to equilibrium values. It is shown that the equation may have nonergodic (no... [Phys. Rev. E 83, 062102] Published Thu Jun 16, 2011

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Structural, transport, thermodynamic, and neutron diffraction studies of layered R_{2}O_{3}Fe_{2}Se_{2} (R=Ce, Pr, Nd, and Sm) (2011)

N. Ni, S. Jia, Q. Huang, E. Climent-Pascual, and R. J. Cava

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-18

Beschreibung: Author(s): N. Ni, S. Jia, Q. Huang, E. Climent-Pascual, and R. J. Cava We report the structural, transport, and thermodynamic properties of the semiconducting, layered rare-earth iron oxyselenides R 2 O 3 Fe 2 Se 2 ( R =Ce, Pr, Nd, and Sm ), which have crystal structures related to the arsenide superconductors except with in-plane oxygens within the Fe square planes. The activat... [Phys. Rev. B 83, 224403] Published Fri Jun 17, 2011

Schlagwort(e): Magnetism

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Digitale ISSN: 1095-3795

Thema: Physik

Publiziert von American Physical Society (APS)

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Two-dimensional XY-like amorphous Co_{68}Fe_{24}Zr_{8}/Al_{70}Zr_{30} multilayers (2011)

Martina Ahlberg, Gabriella Andersson, and Björgvin Hjörvarsson

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-18

Beschreibung: Author(s): Martina Ahlberg, Gabriella Andersson, and Björgvin Hjörvarsson We present an experimental realization of a magnetic two-dimensional XY system using amorphous materials. The classification of the dimensionality is based on the critical behavior of amorphous Co 68 Fe 24 Zr 8 ( d )/Al 70 O 30 (20Å) multilayers, where d =11-16Å . Analysis of the remanent magnetization, the magn... [Phys. Rev. B 83, 224404] Published Fri Jun 17, 2011

Schlagwort(e): Magnetism

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

Publiziert von American Physical Society (APS)

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