Abstract
High field electronic state of the quasi-two dimensional organic superconductor, κ-(BETS) 2 FeBr 4 was investigated. Under the magnetic field exactly parallel to the conducting layers, zero resistance was observed in the region of about 11 ∼ 14 T at 27 mK. This is the strong evidence of the field induced superconductivity in this salt. In the antiferromagnetic state below 5 T, Shubnikov-de Haas oscillation with a low frequency of 62 T was observed. This new frequency can be ascribed to a small pocket formed by the reconstruction of the Fermi surface due to the antiferromagnetic order.
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