Microwave surface impedance of κ-(BEDT-TTF)2Cu(NCS)2, where BEDT-TTF is bis(ethylenedithio)tetrathiafulvalene: Evidence for unconventional superconductivity
D. Achkir, M. Poirier, C. Bourbonnais, G. Quirion, C. Lenoir, P. Batail, D. Jérome
DOI 10.1103/PhysRevB.47.11595 · Physical Review B
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Abstract
High-sensitivity microwave-impedance measurements performed on the quasi-two-dimensional organic superconductor κ-(BEDT-TTF)2Cu(NCS)2 give sound evidence for an unconventional type of superconductivity. The penetration depth λ(T) is in excellent agreement with recent muon-spin-relaxation measurements which are consistent with anisotropic pairings with lines of nodes in the energy gap. The real part of the conductivity σ1 shows a peaked structure which is free of coherence factor effects and results from a competition between two temperature dependences, the penetration depth and the inelastic relaxation time of the normal fluid.
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. | 9.05 | Pressure unresolved | onset |
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