Physics – Condensed Matter – Superconductivity
Scientific paper
1995-04-21
Physics
Condensed Matter
Superconductivity
uuencoded tar.Z, 11 pages with 5 figures, used style files: elsart and graphicx, PS-file available at http://sagar.cas.neu.edu
Scientific paper
10.1016/0022-3697(95)00264-2
We present measurements of the microwave surface resistance Rs and the penetration depth lambda of YBCO:123 crystals. At low T obeys lambda(T) a polynomial behavior, while Rs displays a characteristic non-monotonic T-dependence. A detailed comparison of the experimental data is made to a model of d-wave superconductivity which includes both elastic and inelastic scattering. While the model reproduces the general features of the experimental data, three aspects of the parameters needed are worth noting. The elastic scattering rate required to fit the data is much smaller than measured from the normal state, the scattering phase shifts have to be close to pi/2 and a strong coupling value of the gap parameter 2\Delta(0)/kTc = 6 is needed. On the experimental side the uncertainties regarding the material parameters lambda(0) and Rs,res(0) further complicate a quantitative comparison. For one sample does Rs,res(0) agree with the intrinsic value which results from the d-wave model.
Halbritter J.
Jacobs Thorsten
Rieck Carsten T.
Scharnberg Kurt
Sridhar Srinath
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