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  • 1995-1999  (3)
Document type
Keywords
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Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Local and Nonlocal Effects on the Surface Resistance of d-Wave Superconductors (1999)
    Springer
    Journal of low temperature physics 117 (1999), S. 1295-1299 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Evidence for d-wave superconductivity from measurements of the local conductivity is rather indirect and not very compelling. Very recently, experimental data on the surface resistance taken at five different frequencies on very high quality single crystals of YBa 2 Cu 3 O 7 have become available. Having the frequency as additional variable provides a much more stringent test for the predictive powers of the d-wave model. Because of the high quality of the samples we expect that at low temperatures the nonlocal limit applies to the surface resistance. A nonlocal relation between current and field would allow a direct investigation of the order parameter anisotropy by varying the wave vector q of the radiation relative to the crystal axes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022504608433
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    Paper (German National Licenses)
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  • 2
    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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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Nonlocal Effects on the Surface Resistance of High-Temperature Superconductors with (100) and (110) Surfaces (1999)
    Springer
    Journal of superconductivity 12 (1999), S. 385-393 
    Details
    ISSN: 1572-9605
    Keywords: High-temperature superconductors ; theory ; nonlocal effects ; surface resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The low-temperature surface resistance R s of d-wave superconductors is calculated as function of frequency assuming normal state quasiparticle mean free paths l in excess of the penetration depth. Results depend strongly on the geometric configuration. In the clean limit, two contributions to R s with different temperature dependencies are identified: photon absorption by quasiparticles and pair breaking. The size of nonlocal corrections, which can be positive or negative depending on frequency decreases for given l as the scattering phase shift δ N is increased. However, except in the unitarity limit δ N =0.5π, nonlocal effects should be observable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007709501131
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    Paper (German National Licenses)
    Fulltext
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