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

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...

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Bibliographic Details
Published in:arXiv.org 1999-04
Main Authors: Kharel, A P, Velichko, Anton V, Powell, J R, Porch, A, Lancaster, M J, Humphreys, R G
Format: Article
Language:English
Subjects:
Impedance
Reactance
Surface resistance
Thin films
Yttrium barium copper oxide
Online Access:Get full text
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.9904137