Antiferromagnetic Fluctuations in the Organic Superconductor κ−(BEDT−TTF)2Cu(NCS)2 under Pressure
Megumi Itaya, Yoshihiro Eto, Atsushi Kawamoto, Hiromi Taniguchi
DOI 10.1103/PhysRevLett.102.227003 · Physical Review Letters
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Abstract
We measured the C13-NMR spectrum and T1 of the quasi-two-dimensional organic superconductor κ−(BEDT−TTF)2Cu(NCS)2 under pressure. This material was thought to show a relationship between Tc and the effective cyclotron mass mc*, obtained from the Shubnikov–de Haas (SdH) effect. We found that κ−(BEDT−TTF)2Cu(NCS)2 behaved as a Fermi liquid at low temperature under all pressures, and antiferromagnetic fluctuations were expected. The pressure dependence of the Korringa factor is similar to that of the effective cyclotron mass mc*, suggesting that antiferromagnetic fluctuations contribute to the superconductivity of this material. We also found that, under pressure, T* was shifted to 150 K, the temperature characteristic of the shift from bad metal to good metal.
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. | 10.4 | Pressure unresolved | unknown |
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