MEASUREMENTS OF ANISOTROPIC CHARACTERISTIC LENGTHS IN YBCO FILMS AT MICROWAVE-FREQUENCIES

Citation
H. Jiang et al., MEASUREMENTS OF ANISOTROPIC CHARACTERISTIC LENGTHS IN YBCO FILMS AT MICROWAVE-FREQUENCIES, Journal of applied physics, 73(10), 1993, pp. 5865-5867
Citations number
18
Categorie Soggetti
Physics, Applied
Journal title
ISSN journal
00218979
Volume
73
Issue
10
Year of publication
1993
Part
2A
Pages
5865 - 5867
Database
ISI
SICI code
0021-8979(1993)73:10<5865:MOACLI>2.0.ZU;2-X
Abstract
We used microwave self-resonant and magnetically modulated microwave a bsorption techniques to measure the London penetration depth, lambda, and coherence length, xi, in the direction parallel and perpendicular to the a-b plane of YBCO films. We found that both lambda and xi were anisotropic; it appeared that the value of lambda(parallel-to) (0) was about 1800 angstrom and lambda(perpendicular-to) (86.5) about 26 000 angstrom, where lambda(parallel-to) is the penetration depth for the a pplied microwave electric field parallel and lambda(perpendicular-to) perpendicular to the film plane (c-axis is perpendicular to the film p lane). We deduced xi(parallel-to) to be equal to 129 angstrom and ix(p erpendicular-to) 40 angstrom at 86.5 K. The anisotropy factor y we det ermined to be about 3.