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  • Articles  (22,487)
  • Other Sources  (88)
  • Springer  (21,061)
  • Cambridge University Press
  • 2000-2004  (22,575)
  • 2002  (22,575)
Collection
  • Books  (60)
  • Articles  (22,487)
  • Other Sources  (88)
Source
Keywords
Publisher
Years
  • 2000-2004  (22,575)
Year
Journal
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  • 1
    Electronic Resource
    Electronic Resource
    Some experimental and theoretical studies on the Mn magnetic moment in Y ( Ni 1 - x Mn x ) 2 B 2 C (2002)
    Springer
    The European physical journal 25 (2002), S. 307-311 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 74.25.Jb Electronic structure – 75.10.Lp Band and itinerant models – 75.30.Hx Magnetic impurity interactions – 74.25.Ha Magnetic properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The magnetic moment of the Mn impurities was obtained from magnetization measurements of Y ( Ni 1 - x Mn x ) 2 B 2 C as a function of the concentration x less than 0.15. Using the coherent potential approximation and starting from 3 d density of states, obtained from the first principles calculations, the magnetic moments are obtained within a two sublattice model. For adequately estimated values of the Coulomb interactions U, the position of the energy level of Mn and adopting values for the intersublattice hybridization term, a qualitative agreement with the observed experimental data is obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e20020035
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  • 2
    Electronic Resource
    Electronic Resource
    The September 11 attack: A percolation of individual passive support (2002)
    Springer
    The European physical journal 26 (2002), S. 269-272 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 89.75.Hc Networks and genealogical trees – 05.50.+q Lattice theory and statistics (Ising, Potts, etc.) – 87.23.Ge Dynamics of social systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: A model to terrorism is presented using the theory of percolation. Terrorism power is related to the spontaneous formation of random backbones of people who are sympathetic to terrorism but without being directly involved in it. They just don't oppose in case they could. In the past such friendly-to-terrorism backbones have been always existing but were of finite size and localized to a given geographical area. The September 11 terrorist attack on the US has revealed for the first time the existence of a world wide spread extension. It is argued to have result from a sudden world percolation of otherwise unconnected and dormant world spread backbones of passive supporters. The associated strategic question is then to determine if collecting ground information could have predict and thus avoid such a transition. Our results show the answer is no, voiding the major criticism against intelligence services. To conclude the impact of military action is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e20020089
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  • 3
    Electronic Resource
    Electronic Resource
    Element-specific magnetic long- and short-range order and competing interactions in Gd x Eu 1 - x S (2002)
    Springer
    The European physical journal 26 (2002), S. 273-289 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 75.25.+z Spin arrangements in magnetically ordered materials (including neutron and spin-polarised electron studies, synchrotron-source X-ray scattering, etc.). – 75.40.Cx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.) – 78.70.Ck X-ray scattering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We report on an investigation of the magnetic properties of Gd x Eu 1 - x S mixed crystals with compositions in the range of 0.6 〈 x 〈 1. For the two samples Gd 0.8 Eu 0.2 S and Gd 0.73 Eu 0.27 S a long-range antiferromagnetic order was observed at low temperatures. Element-specific measurements exhibited a different temperature dependence of the reduced sublattice magnetisation of the two magnetic species. A model calculation and Monte Carlo simulations revealed that the different temperature dependence is due to frustration effects. These frustration effects lead to a breakdown of the long-range order for higher europium contents. For the Gd 0.67 Eu 0.33 S-sample we were able to observe a short-range antiferromagnetic order with correlation lengths of a few 10Å with X-ray resonance exchange scattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e20020090
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  • 4
    Electronic Resource
    Electronic Resource
    Generation of 3rd and 5th harmonics in a thin superconducting film by temperature oscillations and isothermal nonlinear current response (2002)
    Springer
    The European physical journal 26 (2002), S. 291-296 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 74.25.Fy Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) – 74.40.+k Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.) – 74.76.-w Superconducting films
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The generation of harmonics of the voltage response is considered when an AC current is applied through a superconducting film above Tc. It is shown that almost at all temperatures the mechanism of the temperature oscillations created by the AC current and the temperature dependence of the resistance dominates over the isothermal nonlinear electric conductivity. Only in a narrow critical region close to Tc the latter is essential for the generation of the harmonics. A detailed investigation of harmonics generation provides an accurate method for measuring the thermal boundary conductance between the film and the insulating substrate. The critical behaviour of the third harmonic will give a new method for the determination of the lifetime of metastable Cooper pairs above Tc. The comparison of the calculated fifth harmonics of the voltage with the experiment is proposed as an important test for the applicability of the employed theoretical models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e20020091
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  • 5
    Electronic Resource
    Electronic Resource
    The asymptotic behaviour of the exact and approximative ν = 1/2   Chern-Simons Green's functions (2002)
    Springer
    The European physical journal 26 (2002), S. 307-318 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 71.10.Pm Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.) – 73.43.-f Quantum Hall effects – 71.27.+a Strongly correlated electron systems; heavy fermions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We consider the asymptotic behaviour of the Chern-Simons Green's function of the ν = 1/ system for an infinite area in position-time representation. We calculate explicitly the asymptotic form of the Green's function of the interaction free Chern-Simons system for small times. The calculated Green's function vanishes exponentially with the logarithm of the area. Furthermore, we discuss the form of the divergence for all τ and also for the Coulomb interacting Chern-Simons system. We compare the asymptotics of the exact Chern-Simons Green's function with the asymptotics of the Green's function in the Hartree-Fock as well as the random-phase approximation (RPA). The asymptotics of the Hartree-Fock Green's function correspondence well with the exact Green's function. In the case of the RPA Green's function we do not get the correct asymptotics. At last, we calculate the self consistent Hartree-Fock Green's function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e20020094
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  • 6
    Electronic Resource
    Electronic Resource
    Probing electron-phonon coupling in high-Tc superconductors by site-selective isotope substitution (2002)
    Springer
    The European physical journal 26 (2002), S. 323-328 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 63.20.Kr Phonon-electron and phonon-phonon interactions – 74.25.Kc Phonons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We consider changes in the electron-phonon coupling in high-T c cuprates caused by site-selective oxygen isotope substitution. Contrary to the total substitution, the site-selective replacement influences the coupling constant for each phonon mode due to the induced changes in the phonon eigenvectors. The relative changes for some modes can be larger than 100%. The measured properties sensitive to these changes are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e20020096
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  • 7
    Electronic Resource
    Electronic Resource
    MO analysis of macroscopic supercurrent flow in MgB 2 (2002)
    Springer
    The European physical journal 26 (2002), S. 297-300 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 74.70.-b Superconducting materials (excluding high-Tc compounds) – 74.50.+r Proximity effects, weak links, tunneling phenomena, and Josephson effects – 74.80.-g Spatially inhomogeneous structures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We present results from an extended magneto-optical (MO) analysis of two samples cut from high-density pellets of MgB2. The first sample was studied in order to show that no matter how large the sample is and despite the bulk granularity, the material enters into a critical state in a crystal-like fashion. The second sample was chosen for the quantitative analysis. A numerical approach based on an inverted 2D Biot-Savart model was used to calculate the current paths across the homogeneous polycrystalline bulk, as well as in the vicinity and across some morphological defects. Local current densities in the homogeneous part were estimated as a function of the applied magnetic field at different temperatures, in three regimes: below full penetration, at full penetration and above full penetration, respectively. A hypothesis of interpretation of the apparent absence of magnetic granularity inside the polycrystalline microstructure is presented. It is related to a critical state likely reached by a network of strongly coupled Josephson junctions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e20020092
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  • 8
    Electronic Resource
    Electronic Resource
    Calculation of partial structure factors of a less-simple binary alloy (2002)
    Springer
    The European physical journal 26 (2002), S. 319-322 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 61.25.Mv Liquid metals and alloys – 61.20.-p Structure of liquids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The partial static structure factors, using the Faber-Ziman (FZ) theory, have been calculated for Ag-In alloy. For 20% Ag at 623 K and 70% Ag at 973 K, the interionic pair potential based on the Bretonnet-Silbert (BS) formalism are calculated and the hard sphere diameters for the component elements are estimated from the potential profile using the linearised Weeks-Chandler-Andersen (LWCA) method. The average number densities are calculated on the assumption that the atomic volumes are simply additive. The calculated structure factors are compared with the experimental values. The partial structure factors for Ag-Ag at 20% Ag and In-In at 70% Ag appear to be slightly out of phase with the calculated values particularly in large q-region. From the calculations it appears that this discrepancy is related to the process of derivation of the experimental structure factors from the total one, and the Ag-In alloy can be described by a mixture of hard spheres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e20020095
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  • 9
    Electronic Resource
    Electronic Resource
    Intercalation and high temperature superconductivity of fullerides (2002)
    Springer
    The European physical journal 26 (2002), S. 3-6 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 74.70.Wz Fullerenes and related materials – 74.72.-h High-Tc compounds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Intercalation of polyatomic molecules into a superconductor can drastically affect the properties of the compound. A mechanism responsible for a large increase in T c for such systems is proposed. It explains the recent remarkable observation of high T c superconductivity in the hole-doped C60/CHX3 (X≡Cl, Br) compounds and the large shift in their T c upon Cl↦Br substitution. The increase in T c is due to contribution to the pairing arising from the interaction of electrons with the vibrational manifold of the molecule. The proposed mechanism opens up the possibility to observe a site-selective isotope effect. We also suggest that intercalating CHI3 would further increase the critical temperature to T c≃ 140 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e20020058
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  • 10
    Electronic Resource
    Electronic Resource
    Giant moments of Fe and Co on and in rubidium aaand potassium films (2002)
    Springer
    The European physical journal 26 (2002), S. 7-11 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 75.20.Hr Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions – 71.20.Dg Alkali and alkaline earth metals – 73.50.-h Electronic transport phenomena in thin films
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Thin quench-condensed films of Rb and K are covered with 1/100 of a mono-layer of Fe or Co. Then the impurities are covered with several atomic layers of the host. The magnetization of the films is measured by means of the anomalous Hall effect (AHE). The magnetization follows a Brillouin function with a magnetic moment of more than 10 Bohr magnetons for bulk Co and Fe impurities. These moments are much larger than the moments of the atomic configurations of Fe and Co and suggest enhanced magnetic moments of the impurities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e20020059
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