Phenomenological Description of Temperature and Frequency Dependence of Surface Resistance of High-Tc Superconductors by Improved Three-Fluid Model

Tadashi IMAI  Yoshio KOBAYASHI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E78-C   No.5   pp.498-502
Publication Date: 1995/05/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Superconducting Electronics and Its Applications)
Category: Microwave devices
Keyword: 
high-Tc superconductor,  improved three-fluid model,  surface resistance,  material quality,  frequency dependence,  

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Summary: 
A calculation method by the improved three-fluid model is shown to describe phenomenologically temperature and frequency dependence of surface resistance Rs for high-Tc superconductors. It is verified that this model is useful to describe temperature dependence of Rs for such high-Tc superconducting films as Y-Ba-Cu-O (YBCO), Eu-Ba-Cu-O, and Tl-Ba-Ca-Cu-O films. For the frequency dependence of Rs of a YBCO bulk, furthermore, the measured results which have not depended on f2 in the frequency range 10-25 GHz, can be described successfully by this model. Finally, a figure of merit is proposed to evaluate material quality for high-Tc superconductors from the values of electron densities and momentum relaxation time determined by the present model.