Thermal and optical tuning of the resonant frequency in YBCO thin films

Authors
Citation
S. Cho et C. Lee, Thermal and optical tuning of the resonant frequency in YBCO thin films, IEEE APPL S, 9(2), 1999, pp. 2943-2946
Citations number
10
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
ISSN journal
1051-8223 → ACNP
Volume
9
Issue
2
Year of publication
1999
Part
3
Pages
2943 - 2946
Database
ISI
SICI code
1051-8223(199906)9:2<2943:TAOTOT>2.0.ZU;2-Z
Abstract
The modulation in the resonant frequency of superconducting passive devices fabricated with YBa2Cu3O7-x (YBCO) thin films has been investigated as a f unction of temperature and optical pulse energy. The frequency-domain measu rements are performed in a closed-cycle refrigerator in a temperature range of 20 to 80 K, The optical excitation consists of a 70 psec laser pulse tr ain at 532 nm from an actively modeloked Nd:YAG laser. The measured optical pulse energy dependence of the resonant frequency is described by f = f(P0 )[1- a(P/P-c)(2)] where P-c is the critical optical pulse energy beyond whi ch resonance has disappeared. As for the dependence on temperature, the res onant frequency can be expressed by f = f(T0)[1 + 2 lambda coth(t/lambda)/d ](-1/2) where the magnetic penetration depth is given by a quadratic depend ence on temperature, lambda = lambda(0)[1 - (T/T-c)(2)](-1/2).