Optical spectroscopy of the neutral-ionic phase transition in a charge-transfer complex: TTF and tetrahalo-p-benzoquinones

Y. Okimoto, S. Horiuchi, E. Saitoh, R. Kumai, H. Okamoto, Y. Tokura

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

Abstract

Far-infrared reflectivity spectra have been investigated for a charge-transfer complex of tetrathiafulvalene and 2-bromo-3,5,6-trichloro-p-benzoquinone, which undergoes a neutral-ionic (N-I) transition at Tc = 68 K. With decrease in temperature toward Tc, the far-infrared reflectivity spectrum is gradually transformed into a Drude-like high reflectance band edging around 100 cm-1, and the optical conductivity shows an anomalous peak around 10 cm-1. The far-infrared anomaly is related to the gigantic dielectric response just above Tc, which are both discussed in terms of dynamics of N-I domain walls with fractional charge.

Original languageEnglish
Pages (from-to)637-639
Number of pages3
JournalSynthetic Metals
Volume133-134
DOIs
Publication statusPublished - 2003 Mar 13
EventISCOM 2001 - Rusutsu, Hokkaido, Japan
Duration: 2001 Sep 102001 Sep 14

Keywords

  • Neutral-ionic domain wall
  • Neutral-ionic transition
  • Optical conductivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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