Bb. Jin et al., A phenomenological description for unusual surface impedance behaviors of high-T-c thin film in weak DC magnetic field, PHYSICA C, 316(3-4), 1999, pp. 224-228
A phenomenological description is presented in this paper for unusual surfa
ce impedance (Z(s)) behaviour of high-T-c thin film in weak DC magnetic fie
ld (B-DC) Unusual Z(s), surface impedance behaviour of YBCO thin film, name
ly, Z(s) decreases with B-DC, is observed with microstrip technique at 77 K
. In our description, the exponential dependence of the increase of superco
nducting electron density on B-DC is assumed to explain unusual Z(s) behavi
our. Combined with the two-fluid model (TFM) and the coupled-grain model, t
he field dependence of Z(s) is computed. Results based on this model agreed
with the experimental results qualitatively. (C) 1999 Elsevier Science B.V
. All rights reserved.