Novel magneto-lattice transition in the mixed-stack charge-transfer complexes with inter-columnar networks

T. Hasegawa, Tomoyuki Akutagawa, T. Nakamura

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)

Abstract

We report on a novel spin-lattice phase transition in an ionic mixed-stack charge-transfer (CT) compound of (BEDO-TTF)(Cl2TCNQ). We found that the rotational modes for rigid-body displacements of molecules afforded an appreciable quantitative variation in the exchange interactions along the mixed stacks, which resulted in the symmetry-invariant first-order magneto-lattice phase transition at around 110K. It was found in the electron paramagnetic resonance (EPR) spectra that the low-temperature strongly interacting spin phase was followed by a magnetic order at 16K. We discuss the origin of the transition at 110K in terms of the competition of free energy between the respective spin states. We also present neutral-ionic (NI) phase transition in the isomorphous compound of (BEDT-TTF)(ClMeTCNQ) under pressure.

Original languageEnglish
Pages (from-to)623-625
Number of pages3
JournalSynthetic Metals
Volume133-134
DOIs
Publication statusPublished - 2003 Mar 13
Externally publishedYes
EventISCOM 2001 - Rusutsu, Hokkaido, Japan
Duration: 2001 Sep 102001 Sep 14

Keywords

  • Mixed-stack complex
  • Neutral-ionic transition BEDT-TTF
  • Spin-lattice transition
  • TCNQ derivative

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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