kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br: A fully gapped strong-coupling superconductor

Authors
Elsinger, H Wosnitza, J Wanka, S Hagel, J Schweitzer, D Strunz, W
Citation
H. Elsinger et al., kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br: A fully gapped strong-coupling superconductor, PHYS REV L, 84(26), 2000, pp. 6098-6101
Citations number
33
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
84
Issue
26
Year of publication
2000
Pages
6098 - 6101
Database
ISI
SICI code
0031-9007(20000626)84:26<6098:KAFGSS>2.0.ZU;2-R
Abstract
High-resolution specific-heat measurements of the organic superconductor ka ppa-(BEDT-TTF)(2)-Cu[N(CN)(2)]Br in the superconducting (B = 0) and normal (B = 14 T) states show a clearly resolvable anomaly at T-c = 11.5 K and an electronic contribution, C-es, which can be reasonably well described by st rong-coupling BCS theory. Most importantly, C-es vanishes exponentially in the superconducting state which gives evidence for a fully gapped order par ameter.