Unusual features in the nonlinear microwave surface impedance of Y-Ba-Cu-O thin films

Details Unusual features in the nonlinear microwave surface impedance of Y-Ba-Cu-O thin films Unusual features in the nonlinear microwave surface impedance of Y-Ba-Cu-O thin films

1999-04-09

arxiv.org/abs/cond-mat/9904137v1

Published in Phys.Rev. B 58, 11189-11192 (1998)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.58.11189

Striking features have been found in the nonlinear microwave (8 GHz) surface impedance $Z_s=R_s + jX_s$ of high-quality YBaCuO thin films with comparable low power characteristics [$R_{res}\sim 35--60 \mu\Omega$ and $\lambda_L(15 K)\sim 130--260 nm$]. The surface resistance $R_s$ is found to increase, decrease, or remain independent of the microwave field $H_{rf}$ (up to 60 mT) at different temperatures and for different samples. However, the surface reactance $X_s$ always follows the same functional form. Mechanisms which may be responsible for the observed variations in $R_s$ and $X_s$ are briefly discussed.

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