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  • American Institute of Physics (AIP)  (3)
  • 1990-1994  (3)
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Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Critical state models for flux-pinning-induced magnetostriction in type-II superconductors (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 4776-4786 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Models and calculated results are presented for the flux-pinning-induced magnetostriction in type-II superconductors. Three models are considered for the critical state; the original Bean model, the Kim model, and the exponential model in which the critical current density is assumed to depend exponentially on the flux density. The analytic expressions of the length change under the magnetic field are derived for specimens having infinite slab geometry and under the assumption that the reversible part of the total magnetization is negligibly small. The results are used for computer simulations and the hysteresis loops are calculated over a wide range of the relevant parameters. Since the pinning-induced magnetostriction reveals the pinning force directly, the hysteresis loops for each model have different features which are discussed in detail. It is also shown that the pinning force of the sample can be directly inferred from the width of the magnetostriction hysteresis loop. Finally, the experimental results on high-temperature superconductors are discussed in comparison with the calculated results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357249
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Wide temperature scaling law of the secondary peak observed in magnetization curves of single crystals (La,Sr)2CuO4 (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 1830-1832 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetization curves of single crystals (La1−xSrx)2CuO4 with various Sr contents were measured. A distinct increase of magnetization with increasing applied field was observed in Sr overdoped compositions, when the magnetic field was applied perpendicular to the CuO2 plane. The field, Bpk , where magnetization showed a maximum value, was strongly dependent on temperature. Its dependence was expressed by a universal relation (square root of)Bpk = c(x)[1−T/Tc(x)] over a wide temperature range; between 4.2 K and Tc. Possible mechanisms which give rise to the observed distinct secondary peak effect are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109563
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  • 3
    Electronic Resource
    Electronic Resource
    Electrical conductivity of a pure C60 single crystal (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 2162-2163 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature dependence of the electrical conductivity of a C60 single crystal is presented in this letter. The single-crystal samples free from solvent contamination were grown up to a size of millimeters order by sublimation of C60 powder with oscillation of the crystal temperature. The electrical conductivity of the single crystal was measured at temperatures between 250 and 295 K. The sharp decrease of the electrical conductivity with temperature around 256 K was observed in association with the phase transition of C60.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108281
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    Paper (German National Licenses)
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