Specific heat measurements of the gap structure of the organic superconductors {kappa}-(ET){sub 2}Cu[N(CN){sub 2}]Br and {kappa}-(ET){sub 2}Cu(NCS){sub 2}.
We present high resolution heat capacity measurements of the organic superconductors {kappa}-(ET){sub 2}Cu[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/T{sub c} {approx}< 0.3, Cel(H=0){approx}T{sup 2} indicating d-wave superconductivity. The data are well described by a strong coupling d-wave model from our base temperature (T/T{sub c}{approx}0.1) right up to T{sub c}. Our data help to resolve the controversy regarding the order parameter symmetry in these materials.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 915009
- Report Number(s):
- ANL/MSD/JA-59238; PRLTAO; TRN: US200817%%60
- Journal Information:
- Phys. Rev. Lett., Vol. 99, Issue 2007; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- ENGLISH
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