Metal-insulator transition of donor-acceptor-type organic charge-transfer complex (BETS)2(Br2TCNQ): Site-selective NMR measurements

K. Hiraki, S. Furuta, T. Takahashi, R. Kondo, S. Kagoshima, T. Hasegawa, T. Mochida, Y. Iwasa

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The roles of donor layers and acceptor stacks in the electronic properties of the charge transfer complex, (BETS)2(Br2TCNQ) were investigated by means of site-selective NMR measurements. Line broadening of 77Se NMR indicating a magnetic ordering on the BETS site was observed at the metal-insulator transition temperature 12 K. This transition is caused by the spin-density-wave formation on the BETS layers. 13C NMR on the cyano carbon in the Br2TCNQ molecule confirms that a spin singlet formation starts to develop on the one dimensional Br2TCNQ columns below 170 K and its three dimensional ordering appears below 80 K. From the analysis of the NMR line shape and shift, magnetic susceptibility was decomposed into the contributions of the BETS and Br2TCNQ sites.

Original languageEnglish
Article number035104
Pages (from-to)351041-351046
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number3
DOIs
Publication statusPublished - Jul 15 2002
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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