Unconventional superconductivity in λ-(BETS)2GaCl4 probed by C13 NMR
T. Kobayashi, H. Taniguchi, A. Ohnuma, A. Kawamoto
DOI 10.1103/PhysRevB.102.121106 · Physical Review B
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Abstract
We performed C13-NMR measurements on an organic superconductor λ−(BETS)2GaCl4 to investigate the superconducting (SC) gap symmetry, where BETS stands for bis(ethylenedithio)tetraselenafulvalene. As the temperature approaches 0 K, the Knight shift in the SC state decreases; the nuclear spin-lattice relaxation rate 1/T1 shows cubic temperature dependence below the SC transition temperature Tc without a coherence peak. These results can be understood in terms of d-wave superconductivity. Moreover, an increase in 1/T1T at lower temperatures was observed just above Tc; this behavior can be interpreted as an effect of spin-density-wave (SDW) fluctuation. We suggest that the d-wave superconductivity of λ−(BETS)2GaCl4 originates from SDW fluctuation.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (BETS)2GaCl4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure unresolved | unknown |
| (BETS)2GaCl4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.1 | Pressure not reported | onset |
| (BETS)2GaCl4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.9 | Pressure not reported | onset |
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