Microscopic observation of superconducting fluctuations in κ-(BEDT-TTF)2Cu[N(CN)2]Br by C13 NMR spectroscopy
T. Kobayashi, Y. Ihara, Y. Saito, A. Kawamoto
DOI 10.1103/PhysRevB.89.165141 · Physical Review B
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Abstract
We performed C13-NMR experiment and measured spin-lattice relaxation rate divided by temperature 1/T1T near the superconducting (SC) transition temperature Tc in κ-(BEDT-TTF)2Cu[N(CN)2]Br (κ-Br salt), and κ-(BEDT-TTF)2Cu(NCS)2 (κ-NCS salt). We observed the reduction of 1/T1T starting at the temperature higher than Tc in κ-Br salt. Microscopic observation of the quasiparticle density of states in the fluctuating SC state revealed the effects of short-range Cooper pairs induced in the normal state to the quasiparticle density of states. We also performed systematic measurements in the fields both parallel and perpendicular to the conduction plane in κ-Br and κ-NCS salts, and confirmed that the reduction of 1/T1T above Tc is observed only in κ-Br salt regardless of the external field orientation.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| 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. | 11.4 | Pressure not reported | 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. | 9.3 | Pressure not reported | unknown |
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