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Microwave surface impedance of YBa2Cu3O7−x :S-wave versusD-wave pairing |
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| Authors: | N. Klein N. Tellmann S. A. Wolf V. Z. Kresin |
| Affiliation: | 1. Institut für Festk?rperforschung, Forschungszentrum Jülich GmbH, D-52425, Jülich, Germany 2. Naval Research Laboratory, 20375-5000, Washington DC 3. Lawrence Berkeley Laboratory, University of California, 94720, Berkeley, CA |
| Abstract: | The low temperature behavior of the microwave surface resistanceR s and the penetration provides information on the pairing state. Fully oxygenated films with low de-resistivity in the normal state exhibit an exponential temperature dependence corresponding to values of the energy gap up to 10 meV. For oxygen deficient films a linearR s(T) was observed, similar to single crystals. This can be explained qualitatively by induced superconductivity in the copper-oxygen chains. |
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