Evidence of antiferromagnetic fluctuation in the unconventional superconductor λ-(BETS)2GaCl4 by C13 NMR
T. Kobayashi, A. Kawamoto
DOI 10.1103/PhysRevB.96.125115 · Physical Review B
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Abstract
We performed C13 NMR measurements on the unconventional organic superconductor λ−(BETS)2GaCl4 to clarify its electronic properties in the paramagnetic state. We found that the spin-lattice relaxation rate divided by temperature 1/T1T shows Curie-like enhancement above 55 K that arises from an antiferromagnetic fluctuation. In addition, we found additional enhancement of 1/T1T below 10 K, where the Knight shift decreases and the linewidth of NMR spectra is broadened. The result could be understood by the magnetic fluctuation induced by the nesting of the Fermi surface. We discovered that λ−(BETS)2GaCl4 salt inherently exhibits the two different types of magnetic fluctuations.
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. | 5.8 | Pressure not reported | onset |
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