Metal-insulator transition in CuIr2S4: XAS results on the electronic structure

M. Croft, W. Caliebe, H. Woo, T. A. Tyson, D. Sills, Y. S. Hor, S. W. Cheong, V. Kiryukhin, S. J. Oh

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S K and Ir L3 x-ray absorption measurements across the temperature-induced metal (M) to insulator (I) transition in CuIr2S4 are presented. Dramatic S K-edge changes reflect the Ir d-electronic state redistribution across this transition. These changes, along with a detailed consideration of the I-phase structure, motivate a model in which the I-phase stabilization involves an interplay of charge and d-orbital orientation ordering along Ir chains, a quadrupling of the Ir-chain repeat unit, and correlated dimer spin-singlet formation.

Original languageEnglish (US)
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number20
StatePublished - May 20 2003

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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