Abstract

We have investigated the magnetic field induced metal-insulator transition (FIMI) in τ-phase organic conductors, which occurs in fields above 35 T, and below 12 K. We report magnetization, thermoelectric, and pressure dependent transport measurements. Our results show that the transition is a bulk thermodynamic process where a magnetic field-dependent gap opens upon entry into the insulating state. The FIMI is rapidly suppressed with pressure. Preliminary ESR measurements at low fields suggest the presence of magnetic order below 12 K.

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