Anomalous charge transport phenomena in molecular-based magnet V(TCNE) x·y(solvent)

G. Du, J. Joo, A. J. Epstein, Joel S. Miller

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40 Citations (Scopus)

Abstract

We present charge transport studies on recently developed molecular-based magnets V(TCNE)x·y(solvent) (TCNE=tetracyanoethylene) which show local magnetic ordering at temperatures, T, as high as 400 K. V(TCNE) x·y(solvent) prepared from the solvent CH2Cl 2 has σ(300 K)∼10-3 S/cm, and that prepared from the solvent CH3CN has σ(300 K)∼10-5 S/cm. The σ(T) of both materials follows the Mott 3D variable range hopping [log(T1/2σ)∝T-1/4] behavior. An anomalously strong T-dependent ac conductivity is likely caused by the short-range ferrimagnetic correlations. Cole-Cole analysis of the ac complex dielectric constant suggests there are two relaxation mechanisms, with an Arrhenius relation fitted to both. The microwave frequency response is consistent with audio frequency data and yields a localization length of ∼ 5 Å, comparable with the dimensions of a [TCNE]-. group.

Original languageEnglish
Pages (from-to)6566-6568
Number of pages3
JournalJournal of Applied Physics
Volume73
Issue number10
DOIs
Publication statusPublished - 1993
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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