Specific heat measurements of the gap structure of the organic superconductors kappa-(ET)2Cu[N(CN)2]Br and kappa-(ET)2Cu(NCS)2
Abstract
We present high resolution heat capacity measurements for the organic superconductors kappa-(ET)2Cu[N(CN)2]Br and kappa-(ET)2Cu(NCS)2 in fields up to 14 T. We use the high field data to determine the normal state specific heat and hence extract the behavior of the electronic specific heat Cel in the superconducting state in zero and finite fields. We find that in both materials for T/Tc<0.3, Cel(H=0) T2 indicating d-wave superconductivity. Our data are inconsistent with s-wave behavior, but may be fitted to a strong coupling d-wave model over the full temperature range.
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