Spin-density wave in the vicinity of superconducting state in λ−(BETS)2GaBrxCl4−x probed by C13 NMR spectroscopy
T. Kobayashi, T. Ishikawa, A. Ohnuma, M. Sawada, N. Matsunaga, H. Uehara, A. Kawamoto
DOI 10.1103/PhysRevResearch.2.023075 · Physical Review Research
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Abstract
C13 NMR and electrical resistivity of λ−(BETS)2GaBr0.75Cl3.25 [BETS: bis(ethylenedithio) tetraselenafulvalene] were simultaneously measured to clarify the electronic state of the insulating phase near the boundary of the superconducting (SC) phase of λ−(BETS)2GaCl4. We found the divergent peak in the nuclear spin-lattice relaxation rate divided by temperature 1/T1T with the metal-insulator transition at 13K, below which the appearance of internal fields in NMR spectra was confirmed. Results of this study indicate that λ−(BETS)2GaBr0.75Cl3.25 undergoes spin-density-wave (SDW) ordering. We suggest that the existence of the SDW phase in the vicinity of the SC phase can explain the unexplainable enhancement of 1/T1T at low temperatures observed in λ−(BETS)2GaCl4, and SDW fluctuation plays an important role in the pairing mechanism of λ-type BETS superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| λ-(BETS)2GaCl4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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