Probing the metalinsulator phase transition in the (DMEDO-EBDT) 2PF 6 single crystal by optical measurements

T. Ishikawa, M. Kitayama, A. Chono, K. Onda, Y. Okimoto, S. Koshihara, Y. Nakano, H. Yamochi, T. Morikawa, T. Shirahata, Y. Misaki

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Abstract

The temperature and polarization dependence of the optical reflectivity spectra of a quasi-one-dimensional 1/4-filled band system, (DMEDO-EBDT) 2PF 6, have been investigated. We observed clear anisotropy in the electronic structures corresponding to the anisotropic transport properties. The appearance of a charge gap (E g>0.1eV) and transfer of the spectral weight accompanied by the metalinsulator phase transition were clearly observed. In addition, a split of the intramolecular vibrational modes was observed, which strongly suggested the existence of charge disproportionation in the low temperature phase. We also observed a photoinduced reflectivity change, which implied the occurrence of a photoinduced phase transition from the low temperature insulating phase to the high temperature metallic phase.

Original languageEnglish
Article number195501
JournalJournal of Physics Condensed Matter
Volume24
Issue number19
DOIs
Publication statusPublished - May 16 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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    Ishikawa, T., Kitayama, M., Chono, A., Onda, K., Okimoto, Y., Koshihara, S., Nakano, Y., Yamochi, H., Morikawa, T., Shirahata, T., & Misaki, Y. (2012). Probing the metalinsulator phase transition in the (DMEDO-EBDT) 2PF 6 single crystal by optical measurements. Journal of Physics Condensed Matter, 24(19), [195501]. https://doi.org/10.1088/0953-8984/24/19/195501