FAR-INFRARED TRANSMISSION OF YBA2CU3O7-DELTA THIN-FILMS

Authors
DEVAULCHIER LA BONTEMPS N VIEREN JP GULDNER Y COMBESCOT R THIVET C GUILLOUXVIRY M PERRIN A
Citation
La. Devaulchier et al., FAR-INFRARED TRANSMISSION OF YBA2CU3O7-DELTA THIN-FILMS, Physica. C, Superconductivity, 235, 1994, pp. 1083-1084
Citations number
5
Categorie Soggetti
Physics, Applied
Journal title
Physica. C, Superconductivity → ACNP
ISSN journal
09214534
Volume
235
Year of publication
1994
Part
2
Pages
1083 - 1084
Database
ISI
SICI code
0921-4534(1994)235:<1083:FTOYT>2.0.ZU;2-B
Abstract
We report transmission measurements of YBa2Cu3O7 thin films at energie s (4 to 85 cm(-1)) far below the gap and temperatures between 20 and 2 50 K. From the frequency dependence, we deduce an electromagnetic pene tration depth at 25 K of 1850 Angstrom. We observe a surprisingly larg e transition width Delta T-c (10% - 90%) of more than 10 K at all ener gies, compared to 0.6 K in DC measurements. We examine this feature in the framework of a strong coupling phenomenology.