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  • 1
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    Direct Observation of Vortex Dynamics in Superconducting Films with Regular Arrays of Defects (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-11-15
    Description: The microscopic mechanism of the matching effect in a superconductor, which manifested itself as the production of peaks or cusps in the critical current at specific values of the applied magnetic field, was investigated with Lorentz microscopy to allow direct observation of the behavior of vortices in a niobium thin film having a regular array of artificial defects. Vortices were observed to form regular and consequently rigid lattices at the matching magnetic field, at its multiples, and at its fractions. The dynamic observation furthermore revealed that vortices were most difficult to move at the matching field, whereas excess vortices moved easily.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Harada -- Kamimura -- Kasai -- Matsuda -- Tonomura -- Moshchalkov -- New York, N.Y. -- Science. 1996 Nov 15;274(5290):1167-70.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉K. Harada, O. Kamimura, H. Kasai, T. Matsuda, A. Tonomura, Advanced Research Laboratory, Hitachi, Ltd., Hatoyama, Saitama 350-03, Japan. V. V. Moshchalkov, Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8895460" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
    Electronic Resource
    Electronic Resource
    InAs/Al0.2Ga0.8Sb quantum well Hall sensors with improved temperature stability (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 2715-2718 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Cross-shaped Hall sensors with high sensitivity and excellent temperature stability were fabricated from quantum wells based on an InAs/Al0.2Ga0.8Sb heterostructure. The layers were grown on semi-insulating GaAs substrates by molecular beam epitaxy. Maximum Hall mobilities of 215 000 cm2/V s with sheet carrier concentrations of 9×1011 cm−2 were measured at 4.2 K for an undoped quantum well structure. These transport properties result in sensitivities as high as 3 T−1 (for voltage drive) and 650 Ω/T (for current drive). Additional Si δ doping in the middle of the InAs quantum well leads to a highly improved temperature stability of the sensitivities. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149834
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  • 3
    Electronic Resource
    Electronic Resource
    Simulation and calibration of an open inductive sensor for pulsed field magnetization measurements (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 2708-2710 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The relation between the voltage induced in an open sensor and the magnetic moment of a sample during pulsed field magnetization measurements has been calculated. The calculation takes into account the size of a sample, its internal flux distribution, and its position with respect to the center of the sensor. It has been found that the behavior of the response signal with respect to the sample position is the same for homogeneously magnetized Ni samples and high temperature superconductors. Because of this universality, it is possible to calibrate the open sensor even in the case of an unfavorable sample geometry. The calculations have been experimentally verified by using Ni samples with different geometries. Our results can easily be extended to samples with an arbitrary local field distribution. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149832
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  • 4
    Electronic Resource
    Electronic Resource
    Stable vortex configurations in superconducting 2×2 antidot clusters (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 3155-3157 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The vortex state of superconducting 2×2 antidot clusters has been studied by transport measurements. Characteristic oscillations have been observed in the magnetoresistance and superconducting-normal phase boundary at specific values of the magnetic flux Φ coming from the formation of stable vortex configurations. In analogy with semiconducting 2×2 quantum dot systems, a bistable diagonal state, perspective for single flux quantum logic applications, has been identified at half-flux filling, Φ/Φ0=0.5, where Φ0=h/2e is the flux quantum. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119118
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  • 5
    Electronic Resource
    Electronic Resource
    Stress release at Y2BaCuO5 inclusions in fast melt processed YBa2Cu3O7−x observed by micro-Raman spectroscopy (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 2897-2899 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied the interface region between the superconducting YBa2Cu3O7−x (123) matrix and the embedded nonsuperconducting Y2BaCuO5 (211) inclusions in fast melt processed samples, by recording micro-Raman spectra along lines crossing these inclusions. The observed relative shifts of the 123 Raman modes indicate the accumulation of compressive stress in the bulk of the 123 material and a release of this stress around the 211 inclusions. These results show that for practical applications of the fast melt processed materials, beside strong pinning, proper mechanical properties around the pinning centers are important. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119046
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  • 6
    Electronic Resource
    Electronic Resource
    Superconductivity and gaint negative magnetoresistance in YBa2Cu3O7/La0.67Ba0.33MnO3 superlattices (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 2564-2566 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is shown that the recently discovered giant negative magnetoresistance (GMR) effects in ferromagnetic La1−xMxMnO3 (M=Ca,Sr,Ba) are compatible with the existence of high Tc superconductivity in c-axis oriented YBa2Cu3O7/La0.67Ba0.33MnO3 superlattices. From magnetoresistivity measurements we deduce that above Tc the giant GMR persists up to room temperature. Below Tc the superlattices show a quasi-two-dimensional superconductivity of the YBa2Cu3O7 layers coexisting with magnetism in the La0.67Ba0.33MnO3 layers. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113168
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  • 7
    Electronic Resource
    Electronic Resource
    Large positive magnetoresistance in Cr/Ag/Cr trilayers (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 1477-1479 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Large positive magnetoresistance (LPMR) effects have been measured at temperatures T〈100 K in epitaxial Cr/Ag/Cr trilayers grown by molecular beam epitaxy. Compared to single Ag films, the magnetoresistance at 4.2 K is enhanced by nearly two orders of magnitude reaching values up to 120% in a field of 8 Tesla. This behavior is related to a drastic modification of the electron scattering at the Ag interfaces due to the presence of the buffer and cap Cr layers. The LPMR curves measured at different temperatures demonstrate a scaling behavior typical for electron transport in two-dimensional systems. The magnitude of the LPMR is a function of temperature and residual resistance ratio and is influenced by the direction of the applied magnetic field. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.118567
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetophotoluminescence of stacked self-assembled InP quantum dots (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 799-801 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report magnetophotoluminescence measurements of stacked layers of self-assembled InP quantum dots. With a magnetic field applied in the growth direction we have determined the exciton reduced mass from the field dependence of the photoluminescence energy. By applying a magnetic field perpendicular to the growth direction, we have analyzed the spatial confinement of the dots in the growth direction. We observe a large increase in the shift of the exciton energy between 0 and 50 T when the thickness of the GaInP spacer layer between the dots is reduced from 8 to 4 nm. This indicates a decrease in spatial confinement in the growth direction which we attribute to strong electronic coupling between vertically stacked dots. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124517
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of sample topology on the critical fields of mesoscopic superconductors (1995)
    [s.l.] : Nature Publishing Group
    Nature 373 (1995), S. 319-322 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The linearized Ginzburg-Landau equation, describing the nucleation of the superconducting state in the presence of a magnetic field H = rot A (refs 1, 3) corresponds to 1/2m(-ihV-e*/cA)2 ψs = αψs (1) and is very similar to the Schrodinger equation for a particle with ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/373319a0
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  • 10
    Electronic Resource
    Electronic Resource
    Galvanomagnetic properties of the Al1−x Six nonequilibrium substitutional solid solutions (1999)
    Springer
    Physics of the solid state 41 (1999), S. 1-7 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Galvanomagnetic characteristics of the A1−x Six solid solutions (x〈12 at. %) have been studied within a broad range of temperatures (1.8–290 K) and magnetic fields (up to 15 T). An anomaly in the concentration dependence of the Hall coefficient R H (x,T=290 K) has been revealed near the boundary of absolute instability (x〈8.5 at. %) of compounds in the Al1−x Six series. The variation of the Hall coefficient and of the magnetoresistance in the A1−x Six series at low (T〈77 K) temperatures is analyzed within models taking into account the anisotropy in conduction-band electron scattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130716
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