Breakdown of the field-induced superconductivity by dynamical spin reversal

Yugo Oshima; Hiroyuki Nojiri; Shinya Uji; James S. Brooks; Takahisa Tokumoto; Heng-Bo Cui; Reizo Kato; Akiko Kobayashi; Hayao Kobayashi

doi:10.1103/PhysRevB.86.024525

Breakdown of the field-induced superconductivity by dynamical spin reversal

Yugo Oshima, Hiroyuki Nojiri, Shinya Uji, James S. Brooks, Takahisa Tokumoto, Heng-Bo Cui, Reizo Kato, Akiko Kobayashi, Hayao Kobayashi

DOI 10.1103/PhysRevB.86.024525 · Physical Review B

T1

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Abstract

The quasi-two-dimensional molecular conductor λ-(BETS)2FeCl4, where BETS is bis(ethylenedithio)tetraselenafulvalene, shows a superconductivity in the high magnetic field environment. This is due to the compensation effect between the external field and the internal field created by the Fe3+ magnetic moment. Here, we report the simultaneous transport and electron spin resonance (ESR) measurements in the field-induced superconducting state down to 1.65 K. We find that the field-induced superconductivity is partially destroyed by ESR transitions, namely, by dynamical spin reversals of Fe3+. Moreover, it is found from our ESR results that the field-induced superconducting state is inhomogeneous, coexisting with the residual paramagnetic metal state.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
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)2FexGa1-xCl4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown