Abstract

Abstract The specific heat of the magnetic field induced superconductors, Eu 0.8 Sn 0.2 Mo 6 S 7- Y Se Y has been measured. The observed Schottky anomaly shows that the Eu ions carry the magnetic moment, and that the anisotropy effect of the crystal field to Eu ions is not so small. Two mechanisms for the magnetic field induced superconductivity (MFIS), Jaccarino-Peter effect and the effect of spin fluctuation, are discussed. While we have found directly the Jaccarino-Peter effect through the hysteresis in the resistance vs. magnetic field curve as reported in LT18, it is confirmed that the effect of the spin fluctuation for the MFIS is reduced by the sizeable anisotropy of the Eu moments.

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