Photoemission study of the metal-insulator transition i

J. Matsuno, T. Mizokawa, A. Fujimori, D. Zatsepin, V. Galakhov, E. Kurmaev

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Abstract

We have studied the electronic structure and its changes across the metal-insulator transition in the spinel-type compound (Formula presented)(Formula presented) using photoemission and inverse-photoemission spectroscopy. Photoemission spectra near the Fermi level show a gap opening of ∼20 meV in the insulating phase, consistent with the transport activation energy. Core-level spectra indicate that the Cu ion is monovalent, and hence Ir is in the intermediate valence state of +3.5. Comparison between the spectra and band-structure calculation reveals that the Ir 5d density of states is strongly distorted, probably due to electron correlation in spite of the general belief of weak correlation in 5d-electron systems.

Original languageEnglish
Pages (from-to)R15979-R15982
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume55
Issue number24
DOIs
Publication statusPublished - 1997 Jan 1

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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