Internal field effect on vortex states in the layered organic superconductor λ-(BETS)2Fe1−xGaxCl4 (x=0.37)
S. Uji, T. Terashima, T. Konoike, T. Yamaguchi, S. Yasuzuka, A. Kobayashi, B. Zhou
DOI 10.1103/PhysRevB.95.165133 · Physical Review B
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Abstract
Resistance and magnetic torque measurements have been performed to investigate an internal field effect on vortex states for a layered organic superconductor λ−(BETS)2Fe1−xGaxCl4 (x=0.37), where BETS = bis(ethylenedithio)tetraselenafulvalene. Because of the internal field by the localized 3d spins of the Fe ions, the superconducting transition temperature has a maximum at 14 T. The strongest energy dissipation due to Josephson vortex dynamics and the largest pinning of pancake vortices are observed at ∼14 T. The interlayer resistance in parallel fields shows a characteristic dip with decreasing temperature. The dip temperature decreases with increasing field, suggesting a Josephson vortex transition. At ∼23 T, we observe another small dip in the field dependence of the interlayer resistance, steep deceases of the perpendicular critical field, and diamagnetism. These results show a phase transition of the superconductivity, which is likely ascribed to an inhomogeneous superconducting transition.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| λ-(BETS)2Fe1-xGaxCl4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | 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. | 6 | Pressure not reported | unknown |
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