13C NMR Study of Layered Organic Superconductors Based on BEDT-TTF Molecules
A. Kawamoto, K. Miyagawa, Y. Nakazawa, K. Kanoda
DOI 10.1103/PhysRevLett.74.3455 · Physical Review Letters
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Abstract
The normal state of the layered organic superconductors κ−(BEDT−TTF)2X ( X=Cu(NCS)2 and Cu[N(CN)2]Br) has been studied by 13C NMR for the first time. The nuclear spin-lattice relaxation rate, T1−1, is greatly enhanced over the value expected from the Korringa relation and shows an anomalous peak around 50 K for both compounds. This is the first experimental evidence of strong antiferromagnetic spin fluctuations in these materials. The depression of the spin fluctuations observed below 50 K coincides with an appearance of Fermi liquid behavior in the charge transport.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(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. | 13 | 0.02 GPa | unknown |
| κ-(BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | unknown |
| κ-(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 unresolved | unknown |
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