Infrared optical conductivity and the electronic phase diagram in the organic superconductor κ-(BEDT-TTF)2X

I. Ito, T. Sasaki, N. Yoneyama, N. Kobayashi, N. Hanasaki, H. Tajima, T. Ito, Y. Iwasa

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

Abstract

The polarized optical reflectance spectra of κ-(BEDT-TTF) 2Cu(NCS)2 and its deuterated one are measured in the infrared region. Both the specific molecular vibration mode v3(a g) of the BEDT-TTF molecule and the optical conductivity hump in the mid-infrared region change correlatively at T*=45-50K. The results suggest that the electron-molecular vibration coupling on the v3(a g) mode becomes weak due to the enhancement of the itinerant nature of the carriers on the BEDT-TTF dimers below T*. The present observations demonstrate that two different metallic states are regarded as a correlated good metal below T* and a half filling bad metal above T*.

Original languageEnglish
Pages (from-to)321-322
Number of pages2
JournalJournal De Physique. IV : JP
Volume114
DOIs
Publication statusPublished - 2004
EventISCOM 2003: 5th International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets - Port-Bourgenay, France
Duration: 2003 Sep 212003 Sep 26

Keywords

  • Electron-molecular vibration coupling
  • Optical conductivity
  • κ-(BEDT-TTF)Cu(NCS)

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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