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Magnetic Field Effects on Nonlinear Electrical Transport in λ-(BEDT-TSF)2FeCl4, where BEDT-TSF is bis(ethylenedithio)tetraselenafulvalene

We have studied magnetic field effects on the nonlinear electrical transport associated with a negative resistance and switching phenomena in an antiferromagnetic insulating (AFI) ground state of the title π– d coupled conductor below the metal-to-insulator transition temperature T MI =8.3 K. The overall characteristics of current density ( J ) versus electric field ( E ) are well reproduced by an empirical formula with a current-density-dependent conductivity proportional to J n ; if n >1, a negative resistance effect (d J /d E 0) appears. With increasing magnetic field, there appears a crossover from n >1 to n <1 around H * ≃7 T, followed by a conventional ohmic transport at fields higher than the critical magnetic field H C =10.6 T at 4.2 K for the reentrant metallic transition. A switching phenomenon, which always occurs at J < J T in the well-ordered AFI states, triggers a discontinuous transition from low-c...