Relaxor-like behavior in λ-(BETS)2FeCl4 studied by SR X-ray diffraction

Satoshi Komiyama, Masashi Watanabe, Yukio Noda, Eiichi Negishi, Naoki Toyota

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


We performed precise X-ray diffraction measurements on an organic conductor, λ-(BETS)2FeCl4, with synchrotron radiation, where BETS is bis(ethylendithio)tetraselenafulvalene. Around 70 K (=TFM), the width of the Bragg reflection increased, and its peak was split into two with decreasing temperature. The direction of splitting was 0.017a*-0.010b*+0.002c* in the reciprocal space. At 8.3 K (=TMI), the discontinuous change in c* was observed, and the peak of the Bragg reflection became single again, but remained broad. In the temperature region of TFM > T > TMI, it is considered that the system has a heterogeneous structure, and the coexistence of the high- and low-temperature phases below TFM is presumably related to the anomalous behavior of dielectric constant in the metallic phase. The size of regions/domains was estimated to be about 0.4 μm.

Original languageEnglish
Pages (from-to)2385-2388
Number of pages4
Journaljournal of the physical society of japan
Issue number9
Publication statusPublished - 2004 Sep
Externally publishedYes


  • Ferroelectric material
  • Relaxor
  • Synchrotron radiation
  • X-ray diffraction

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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