Magnetic field effects on nonlinear electrical transport in λ-(BEDT-TSF)2FeCl4, where BEDT-TSF is bis(ethylenedithio)tetraselenafulvalene

Naoki Toyota, Yasunori Abe, Takahiko Kuwabara, Eiichi Negishi, Hiroshi Matsui

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

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 TMI = 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 Jn; if n > 1, a negative resistance effect (dJ/dE < 0) appears above threshold JT, 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 HC = 10.6 T at 4.2 K for the reentrant metallic transition. A switching phenomenon, which always occurs at J < JT in the well-ordered AFI states, triggers a discontinuous transition from low-conductivity to high-conductivity states, followed by the negative resistance at J > JT which can be ascribed to a carrier's self-decondensation process.

Original languageEnglish
Pages (from-to)2714-2717
Number of pages4
Journaljournal of the physical society of japan
Volume72
Issue number11
DOIs
Publication statusPublished - 2003 Nov 1

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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