High-Frequency Surface Impedance of Dirty Type-II Superconductors in the Surface-Sheath Regime
- 10 December 1968
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 176 (2) , 581-589
- https://doi.org/10.1103/physrev.176.581
Abstract
Surface-resistance measurements in the superconducting surface-sheath regime of Pb-In and Pb-Bi alloys are analyzed in the light of the recent theories of dirty type-II superconductors. From the changes of slope of the surface resistance at , the temperature dependence of the parameter can be deduced. For the alloys investigated, it is found that varies more strongly with temperature than expected from the dirty-limit theory. It is believed that this reflects strong-coupling effects. From the value of at , the absolute value of the sheath thickness can also be derived. This is found to agree well, near , with the theoretical predictions of Fink and Kessinger. The analysis of the experimental data suggests that weak-coupling formalism remains applicable in the strong-coupling limit, and that deviations appear as modified temperature dependences of the critical fields. The and found for the two alloys are nevertheless rather close to the weak-coupling predictions.
Keywords
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