Metallic Properties of 1:1 Charge-Transfer Salt, Dimethyltetraselenoanthracene-Tetrafluoroborate (DMTSA-BF4)

Jian Dong, Kyuya Yakushi, Kazuo Takimiya, Tetsuo Otsubo

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Pseudo-one-dimensional charge-transfer salt DMTSA-BF4 shows high electrical conductivity (σRT ≈ 500 Scm-1) and metallic temperature dependence down to ca. 160K, in contrast to the conventional half-filled organic conductors which are regarded as Mott insulators. The pseudo-one-dimensionality is evidenced by the polarized reflectance spectra. The electrical resistivity, thermopower magnetic susceptibility, and polarized reflectance spectrum suggest that DMTSA-BF4 is a metal above ca. 150K. This compound is the first metal among the 1:1 organic charge-transfer salts The low-temperature reflectance spectrum suggests that the glide plane symmetry is broken below 150K and the fluctuation of this broken symmetry is already observed at room temperature The metal-insulator transition around 150K is regarded as Peierls transition. The Hubbard parameter U/W is estimated to be <0.8, which may be the possible reason for the metallic nature in high-temperature phase.

Original languageEnglish
Pages (from-to)971-977
Number of pages7
Journaljournal of the physical society of japan
Volume67
Issue number3
DOIs
Publication statusPublished - 1998 Jan 1
Externally publishedYes

Keywords

  • DMTSA salt
  • Magnetic susceptibility
  • Organic conductor
  • Reflectance spectrum
  • Transport property

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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