Compensation of Effective Field in the Field-Induced Superconductor κ−(BETS)2FeBr4 Observed by Se77 NMR
S. Fujiyama, M. Takigawa, J. Kikuchi, H.-B. Cui, H. Fujiwara, H. Kobayashi
DOI 10.1103/PhysRevLett.96.217001 · Physical Review Letters
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Abstract
We report results of Se77 NMR frequency shift in the normal state of the organic charge-transfer salt κ−(BETS)2FeBr4 which shows magnetic field-induced superconductivity (FISC). From a simple mean-field analysis, we determined the field and the temperature dependences of the magnetization mπ of the π conduction electrons on BETS molecules. We found that the Fe spins are antiferromagnetically coupled to the π electrons and determined the exchange field to be J=−2.3 T/μB. The exchange field from the fully saturated Fe moments (5μB) is compensated by an external field of 12 T. This is close to the central field of the FISC phase, consistent with the Jaccarino-Peter local field-compensation mechanism for FISC [Phys. Rev. Lett. 9, 290 (1962)].
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(BETS)2FeBr4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.3 | Pressure not reported | unknown |
| κ-(BETS)2FeBr4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.1 | Pressure unresolved | unknown |
| λ-(BETS)2FeCl4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| λ-(BETS)2GaCl4 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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