Study on the pressure induced charge transfer phase transition in (C 5H11)4N(FeIIFeIII(C 2O2S2)3) by means of μsR spectroscopy

Masaya Enomoto, Noriyuki Kida, Norimichi Kojima, Isao Watanabe, Takao Suzuki, Yasuyuki Ishii

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Abstract

We have investigated the magnetic properties of iron mixed-valence complexes, (n-CnH2n+1) 4N[FeIIFeIII(dto)3] (dto = C 2O2S2, n = 3, 5), in which not only a ferromagnetic transition but also a novel charge transfer phase transition (CTPT) take place [1]. This CTPT can be observed under ambient pressure for n = 3, while it appears abruptly above 0.5 GPa for n = 5 [2]. Recently, we have measured the muon spin relaxation (μSR) for the CTPT of n = 3, which revealed the dynamical process of electron-transfer between FeII and Fe III and its frequency was estimated at about 0.1 MHz [3]. To investigate the pressure induced CTPT for n = 5, we carried out the μSR measurement for n = 5 at 150 K between 0.30 and 0.64 GPa with the 4He gas-operated pressure system. The asymmetry of the muon spin relaxation for n = 5 with Cu-Be pressure cell was almost constant up to 0.55 GPa, while it rapidly decreased with increasing pressure above 0.60 GPa. This result shows that the applied pressure causes the spin fluctuation due to the CTPT, which induces the decrease of the asymmetry of muon spin relaxation. This experiment can correctly decide the phase transition pressure from the absence to the appearance of the CTPT for n = 5.

Original languageEnglish
Pages (from-to)3137-3139
Number of pages3
JournalPolyhedron
Volume30
Issue number18
DOIs
Publication statusPublished - 2011 Nov 28

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Keywords

  • Ferromagnetism
  • Iron mixed valence complex
  • Pressure induced charge transfer phase transition
  • μSR

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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