High-resolution ac-calorimetry studies of the quasi-two-dimensional organic superconductor κ−(BEDT−TTF)2Cu(NCS)2
J. Müller, M. Lang, R. Helfrich, F. Steglich, T. Sasaki
DOI 10.1103/PhysRevB.65.140509 · Physical Review B
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Abstract
We report high-resolution specific-heat measurements on the quasi-two-dimensional organic superconductor κ−(BEDT−TTF)2Cu(NCS)2, performed by using a sensitive ac-modulation technique. The main observations are (i) a discontinuity at Tc much in excess of what is expected for a weak-coupling BCS superconductor and (ii) a quasiparticle contribution to the specific heat with an exponentially weak temperature dependence at T≪Tc. The latter finding is incompatible with an order parameter that vanishes at certain parts of the Fermi surface. The data for T<~Tc can be well described by a strong-coupling extension of the BCS theory — the α-model — similar to what has been recently found for the κ−(BEDT−TTF)2Cu[N(CN)2]Br salt [Elsinger et al., Phys. Rev. Lett. 84, 6098 (2000)].
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9 | Pressure not reported | onset |
| (BEDT-TTF)2Cu(N(CN)2)Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| (BEDT-TTF)2Cu(N(CN)2)Cl 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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