Anomalous Splitting of 1H-NMR Spectra in λ -(BEDT-TSF)2FeCl4

Satoshi Endo, Takayuki Goto, Tetsuo Fukase, Hiroshi Matsui, Hiroshi Uozaki, Hideaki Tsuchiya, Eiichi Negishi, Yusuke Ishizaki, Yasunori Abe, Naoki Toyota

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


For an organic π-d metal λ-(BEDT-TSF)2FeCl 4, where BEDT-TSF is an abbreviation of bis(ethylenedithio)tetraselenafulvalene, we have measured 1H-NMR to clarify the quite anomalous ferroelectric-like metallic states below T FM = 70 K recently found in the microwave conductivity and specific heat measurements as well as the metal-to-insulator transition at T MI = 8.3 K associated with antiferromagnetic ordering. Just at the temperature TFM, the second-order ferroelectric-like phase transition temperature, a single peak at higher temperatures of 100 K and 80 K starts to split into three asymmetric peaks, which are analyzed by Gaussian deconvolution with three components. It is considered that this anomalous splitting of the NMR spectra is attributed to the hyperfine field between the proton nucleus and π electrons. This anomaly at TFM is discussed in terms of a charge disproportionation.

Original languageEnglish
Pages (from-to)732-734
Number of pages3
Journaljournal of the physical society of japan
Issue number3
Publication statusPublished - 2002 Mar


  • Antiferromagnetic order
  • Charge disproportionation
  • Dielectric anomaly
  • H-NMR
  • Metal-to-insulator transition
  • λ-(BEDT-TSF)FeCl

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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