Abstract
The microwave surface impedance of the high-T c oxide superconductors has been measured at many laboratories around the world. A survey of their data between 100 MHz and 150 GHz for polycrystalline as well as single crystalline samples is given, focusing on YBa2Cu3O7−δ . In comparison to the classical superconductors, these results reveal a very similar temperature dependence of the surface impedance close toT c but an anomalous high residual surface resistance at lower temperatures. Both features can be explained by the assumption that oxide superconductors contain a significant number of nonpairing charge carriers. Within the framework of a properly extended two-fluid model, this is shown by analysis of our best thin-film data. Moreover, the enhanced losses in polycrystalline material especially for superposed magnetostatic fields result, to a large extent, from the deeper penetration depth. The possible origin of the nonpairing charge carriers and their impact on the applicability of the oxide superconductors is briefly discussed.
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Müller, G., Klein, N., Brust, A. et al. Survey of microwave surface impedance data of high-T c superconductors—Evidence for nonpairing charge carriers. Journal of Superconductivity 3, 235–242 (1990). https://doi.org/10.1007/BF00625263
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DOI: https://doi.org/10.1007/BF00625263