Real space imaging of the metal-insulator phase separation in the band width controlled organic Mott system κ-(BEDT-TTF)2Cu[N(CN) 2]Br

T. Sasaki, N. Yoneyama, A. Suzuki, N. Kobayashi, Y. Ikemoto, H. Kimura

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42 Citations (Scopus)

Abstract

Systematic investigation of the electronic phase separation on macroscopic scale is reported in the organic Mott system κ-(BEDT-TTF) 2Cu[N(CN)2]Br. Real space imaging of the phase separation is obtained by means of scanning micro-region infrared spectroscopy using the synchrotron radiation. The phase separation appears near the Mott boundary and changes its metal-insulator fraction with the substitution ratio x in κ-[(h-BEDT-TTF)1-x(d-BEDT-TTF)x]2Cu[N(CN) 2]Br, of which band width is controlled by the substitution ratio x between the hydrogenated BEDT-TTF molecule (h-BEDT-TTF) and the deuterated one (d-BEDT-TTF). The phase separation phenomenon observed in this class of organics is considered on the basis of the strongly correlated electronic phase diagram with the first order Mott transition.

Original languageEnglish
Pages (from-to)2351-2360
Number of pages10
Journaljournal of the physical society of japan
Volume74
Issue number8
DOIs
Publication statusPublished - 2005 Aug

Keywords

  • Infrared reflectance spectra
  • Mott transition
  • Organic superconductor
  • Phase separation
  • Synchrotron radiation
  • κ-(BEDT-TTF)Cu[N(CN)]Br

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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