Electronic states in magnetic fullerides studied by ESR under pressure

K. Mizoguchi, S. Kobayashi, M. Machino, H. Sakamoto, T. Kawamoto, M. Tokumoto, M. Kosaka, K. Tanigaki, A. Omerzu, D. Mihailovic

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)

Abstract

TDAE-C60 and AC60 are well known monoanion-C60 compounds, where TDAE is tetrakis-dimethylaminoethylene and A is Rb or Cs. The former compound is the soft ferromagnet (FM) below 16 K and the latter is a [2 + 2]-cycloadduct 1D polymer with the antiferromagnetic (AF) ground state below 50 K. Although several mechanisms for the FM in TDAE-C60 have been proposed, the present study under high pressures suggests the ordering of orbitals of Jahn-Teller distorted C60. So far, AF transition below 50 K in RbC60 has been interpreted as the metal-insulator transition driven by instability of half-filled 1D Fermi surface. However, the present study combined with the resistivity data under pressure revealed RbC60 to be a 3D Mott-Hubbard system with the AF-metallic phase arising from magnetic frustration in a fcc-like structure.

Original languageEnglish
Pages (from-to)695-696
Number of pages2
JournalSynthetic Metals
Volume133-134
DOIs
Publication statusPublished - 2003 Mar 13
EventISCOM 2001 - Rusutsu, Hokkaido, Japan
Duration: 2001 Sep 102001 Sep 14

Keywords

  • ESR
  • Fullerides
  • Magnetic phase transition
  • Orbital order
  • Polymer
  • Pressure

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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