kappa-(BEDT-TTF)2Cu[N(CN)(2)]Br: a fully gapped strong-coupling superconductor.
High-resolution specific-heat measurements of the organic superconductor kappa-(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 strong-coupling BCS theory. Most importantly, C(es) vanishes exponentially in the superconducting state which gives evidence for a fully gapped order parameter.
Elsinger
H
H
Physikalisches Institut, Universität Karlsruhe, 76128 Karlsruhe, Germany.
Wosnitza
J
J
Wanka
S
S
Hagel
J
J
Schweitzer
D
D
Strunz
W
W