論文でました。
Phys. Rev. B 86, 024525 (2012) [7 pages]
"Breakdown of the field-induced superconductivity by dynamical spin reversal"
Y. Oshima et al.

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.
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