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  • 64  (1)
  • Y1Ba2Cu3O7−δ grain aligned  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Surface impedance of epitaxial YBCO thin films — Comparison of experimental data with a d-wave theory of superconductivity (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 503-508 
    Details
    ISSN: 1573-7357
    Keywords: 05.70 Ln ; 05.70 Jk ; 64
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The surface impedance of two 350nm thick YBCO films was measured for temperatures between 4.2K and 150K in a copper cavity at 87 GHz. Both films, one grown by electron beam evaporation on MgO, the other one by high oxygen-pressure dc sputtering from a stoichiometric target on LaAlO3, provide critical temperatures of about 91K, low residual surface resistances of Rs(4.2K) 〈 1mΩ and low specific resistivities in the normal state of ϱ(100K) 〈 85μΩcm. The experimental data obtained on these two films are compared to a d-wave model of superconductivity which incorporates elastic and inelastic scattering. Good agreement between theory and the experimental results for both the surface resistance and the penetration depth in the whole temperature range is achieved for scattering phase shifts near 0.4π and order parameter amplitudes in the range of 2Δ0(0)/kBTc = 6.0 – 7.5 without subtracting an extrinsic residual surface resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768435
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  • 2
    Electronic Resource
    Electronic Resource
    Microwave surface resistance of granular anisotropic superconductors (1990)
    Springer
    Journal of superconductivity 3 (1990), S. 269-276 
    Details
    ISSN: 1572-9605
    Keywords: Surface resistance ; electrophoretic films ; Y1Ba2Cu3O7−δ grain aligned
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The effective-medium approach is used to calculate the surface resistance of materials consisting of uniaxial grains imbedded in an isotropic background. The grains are taken to be superconducting in theab-plane. The mean free path dependence of theac-conductivity in the superconducting state is explicitly taken into account. In thec-direction the grains are assumed to have negligible conductivity. The background is taken to be a normal Drude conductor. This model should represent a reasonable description of high-T c materials. Large residual surface resistances can be fitted if the samples contain 10–20% background material, which is a good conductor. Agreement between theory and experiment can be improved if gap anisotropy is taken into account.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00625267
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