Photoemission study of the metal-insulator transition in CuIr2S4

J. Matsuno, Takashi Mizokawa, A. Fujimori, D. A. Zatsepin, V. R. Galakhov, E. Z. Kurmaev, Y. Kato, S. Nagata

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Abstract

We have studied the electronic structure and its changes across the metal-insulator transition in the spinel-type compound CuIr2S4 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
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume55
Issue number24
Publication statusPublished - 1997 Jun 15
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Matsuno, J., Mizokawa, T., Fujimori, A., Zatsepin, D. A., Galakhov, V. R., Kurmaev, E. Z., Kato, Y., & Nagata, S. (1997). Photoemission study of the metal-insulator transition in CuIr2S4. Physical Review B - Condensed Matter and Materials Physics, 55(24).