Nonlinear electrical transport in λ-(BEDT-TSF)2FeCl4

Naoki Toyota, Yasunori Abe, Hiroshi Matsui, Eiichi Negishi, Yusuke Ishizaki, Hideaki Tsuchiya, Hiroshi Uozaki, Satoshi Endo

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25 Citations (Scopus)


We study the current-voltage (I-V) characteristics in a quasi-two-dimensional, π-d coupled organic conductor λ-(BEDT-TSF)2FeCl4 which undergoes a metal-to-insulator transition associated with an antiferromagnetic ordering at TMI = 8.3 K. Drastic nonlinear transport phenomena are observed in the I-V curve, revealing a so-called negative resistance effect at an applied electric field or a current density higher than threshold ET or JT. The overall I-V curves are quite well explained phenomenologically by a nonlinear equation for a positive feedback system that the nonlinear conductivity proportional to Jn with n = 1.4(×0.1). This indicates that some carrier decondensation mechanism works in the present antiferromagnetic insulator. Discussions are presented by following quite similar nonlinear phenomena observed in a variety of quasi-one-dimensional, mixed-stack, and segregated-stack, organic insulators.

Original languageEnglish
Article number033201
Pages (from-to)332011-332014
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number3
Publication statusPublished - 2002 Jul 15


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