Anomalous microwave response of high-temperature superconducting thin-film microstrip resonator in weak dc magnetic fields

Details Anomalous microwave response of high-temperature superconducting thin-film microstrip resonator in weak dc magnetic fields Anomalous microwave response of high-temperature superconducting thin-film microstrip resonator in weak dc magnetic fields

1999-08-29

arxiv.org/abs/cond-mat/9908429v1

Physica C 328 (1999) 60-66

Physics

Condensed Matter

Superconductivity

REVTex 3.1, 5 pages, 6 EPS figures, submitted to Physica C

Scientific paper

10.1016/S0921-4534(99)00534-1

We have studied an anomalous microwave (mw) response of superconducting YBa_{2}Cu_{3}O_{7-delta} (YBCO) microstrip resonators in the presence of a weak dc magnetic field, H_{dc}. The surface resistance (R_{s}) and reactance (X_{s}) show a correlated non-monotonic behaviour as a function of H_{dc}. R_{s} and X_{s} were found to initially decrease with elevated H_{dc} and then increase after H_{dc} reaches a crossover field, H_{c}, which is independent of the amplitude and frequency of the input mw signal within the measurements. The frequency dependence of R_{s} is almost linear at fixed H_{dc} with different magnitudes (H_{c}). The impedance plane analysis demonstrates that r_{H}, which is defined as the ratio of the change in R_{s}(H_{dc}) and that in X_{s}(H_{dc}), is about 0.6 at H_{dc}H_{c}. The H_{dc} dependence of the surface impedance is qualitatively independent of the orientation of H_{dc}.

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