Fermi surface reconstruction in the magnetic-field-induced superconductor κ−(BETS)2FeBr4
T. Konoike, S. Uji, T. Terashima, M. Nishimura, S. Yasuzuka, K. Enomoto, H. Fujiwara, E. Fujiwara, B. Zhang, H. Kobayashi
DOI 10.1103/PhysRevB.72.094517 · Physical Review B
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Abstract
Shubnikov-de Haas (SdH) and angular dependent magnetoresistance oscillations (AMROs) are measured in the organic superconductor with magnetic anions, κ−(BETS)2FeBr4. In the paramagnetic phase (μ0H>μ0Hc=5.5T), the AMROs and the SdH oscillations are clearly observed, which are basically consistent with the band structure calculation. In the canted antiferromagnetic phase (H<Hc), a low frequency SdH oscillation is observed. The observation of the oscillation is not interpreted by the simple FS reconstruction due to the long range order of the Fe 3d spins and implies that the strong correlation between the π and d electrons modifies the reconstruction. No sign of the enhancement of the critical quantum fluctuation at Hc is observed in the SdH oscillations, the reason of which is also discussed.
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. | 1.4 | Pressure not reported | unknown |
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