κ-(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.