Hysteresis measurement of anomalous microwave surface resistance in superconducting thin films

Details Hysteresis measurement of anomalous microwave surface resistance in superconducting thin films Hysteresis measurement of anomalous microwave surface resistance in superconducting thin films

2000-01-03

arxiv.org/abs/cond-mat/0001016v3

Physics

Condensed Matter

Superconductivity

2 pages, 1 figure, submitted to Physica C for M2S-HTSC-VI Proceedings

Scientific paper

The anomalous decrease in microwave surface resistance, R_{s}, of superconducting YBa_{2}Cu_{3}O_{7-d} (YBCO) thin films in the presence of a low dc magnetic field is studied using a microstrip resonator technique. We have done a dc field hysteresis measurement of R_{s} to study the effects of vortex penetration on the anomalous effect. It is shown that the anomaly happens at a field level far below the low critical field, H_{c1,strip}, of the superconducting microstrip and vortex (Abrikosov) penetration would eliminate the anomalous effect observed at low field. This implies that the anomalous effect is not contributed by vortices.

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