Specific-Heat Measurements of the Gap Structure of the Organic Superconductors κ−(ET)2Cu[N(CN)2]Br and κ−(ET)2Cu(NCS)2
O. J. Taylor, A. Carrington, J. A. Schlueter
DOI 10.1103/PhysRevLett.99.057001 · Physical Review Letters
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Abstract
We present high resolution heat capacity measurements of the organic superconductors κ−(ET)2Cu[N(CN)2]Br and κ−(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. The data are well described by a strong coupling d-wave model from our base temperature (T/Tc∼0.1) right up to Tc. Our data help to resolve the controversy regarding the order parameter symmetry in these materials.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(ET)2Cu[N(CN)2]Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12.25 | Pressure unresolved | midpoint |
| κ-(ET)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.56 | Pressure unresolved | midpoint |
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