Specific heat of superconducting κ-(BEDT-TTF)2Cu(NCS)2 near Tc [where BEDT-TTF is bis(ethylenedithio)tetrathiafulvalene]
J. E. Graebner, R. C. Haddon, S. V. Chichester, S. H. Glarum
DOI 10.1103/PhysRevB.41.4808 · Physical Review B
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Abstract
High-resolution specific-heat measurements on a small (0.2 mg) single crystal of κ-(BEDT-TTF)2Cu(NCS)2 in magnetic fields up to 5 T reveal a jump ΔC at Tc. Comparison with γ=34 mJ/mol K2 derived from Pauli paramagnetism yields ΔC/γTc=1.50±0.15, within experimental error of the BCS value of 1.43. Application of a magnetic field broadens the transition but depresses it only slightly: -Hc2′=16 T/K for H parallel to the planes, 0.75 T/K perpendicular. These very large values are, respectively, factors of 7 and 4 times higher than reported from magnetoresistance data, suggesting that flux-flow resistance obscures Tc in magnetoresistance measurements, much as it does in the ceramic high-Tc materials. No evidence is found for the presence of an anomaly near 4 K, as observed in proton NMR relaxation rates.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.4 | Pressure unresolved | midpoint |
| κ-(BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.5 | Pressure unresolved | onset |
| Ba0.6K0.4BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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