Electric-field-induced intradimer charge disproportionation in the dimer-Mott insulator β′-(BEDT-TTF)2IC l2

Yuma Hattori, Satoshi Iguchi, Takahiko Sasaki, Shinichiro Iwai, Hiromi Taniguchi, Hideo Kishida

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5 Citations (Scopus)


Raman scattering spectra of the dimer-Mott insulator β′-(BEDT-TTF)2ICl2 [BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene] under a static electric field are investigated. The application of the electric field induces two additional Raman peaks on both sides of the original peak position of the charge-sensitive Raman mode (ν2) in the spectra. At 10 kV/cm, the original peak almost disappears and only the newly emerging peaks are observed. The emergence of these peaks indicates the field-induced charge disproportionation within the dimer. The temporal change of the Raman signals with the inversion of the electric field suggests a macroscopic domain formation of the charge-disproportionate dimers. This picture is reinforced by the direct measurement of the polarization.

Original languageEnglish
Article number085149
JournalPhysical Review B
Issue number8
Publication statusPublished - 2017 Feb 28

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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