## Abstract

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 (dJ/dE < 0) appears above threshold J_{T}, while, if n < 1, a monotonic nonlinear resistance (dJ/dE > 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-conductivity to high-conductivity states, followed by the negative resistance at J > J_{T} which can be ascribed to a carrier's self-decondensation process.

Original language | English |
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Pages (from-to) | 2714-2717 |

Number of pages | 4 |

Journal | journal of the physical society of japan |

Volume | 72 |

Issue number | 11 |

DOIs | |

Publication status | Published - 2003 Nov |

## Keywords

- Magnetic field effect
- Metal-insulator transition
- Negative resistance
- Nonlinear transport
- Switching

## ASJC Scopus subject areas

- Physics and Astronomy(all)

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