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

Research output: Contribution to journalArticle

93 Citations (Scopus)

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

Fingerprint

Metal insulator transition
Photoemission
photoelectric emission
insulators
Electron correlations
Core levels
Photoelectron spectroscopy
Fermi level
Band structure
metals
Electronic structure
Activation energy
Ions
spinel
Electrons
electrons
activation energy
electronic structure
valence
spectroscopy

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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

Photoemission study of the metal-insulator transition in CuIr2S4. / Matsuno, J.; Mizokawa, Takashi; Fujimori, A.; Zatsepin, D. A.; Galakhov, V. R.; Kurmaev, E. Z.; Kato, Y.; Nagata, S.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 55, No. 24, 15.06.1997.

Research output: Contribution to journalArticle

Matsuno, J, Mizokawa, T, Fujimori, A, Zatsepin, DA, Galakhov, VR, Kurmaev, EZ, Kato, Y & Nagata, S 1997, 'Photoemission study of the metal-insulator transition in CuIr2S4', Physical Review B - Condensed Matter and Materials Physics, vol. 55, no. 24.
Matsuno J, Mizokawa T, Fujimori A, Zatsepin DA, Galakhov VR, Kurmaev EZ et al. Photoemission study of the metal-insulator transition in CuIr2S4. Physical Review B - Condensed Matter and Materials Physics. 1997 Jun 15;55(24).
Matsuno, J. ; Mizokawa, Takashi ; Fujimori, A. ; Zatsepin, D. A. ; Galakhov, V. R. ; Kurmaev, E. Z. ; Kato, Y. ; Nagata, S. / Photoemission study of the metal-insulator transition in CuIr2S4. In: Physical Review B - Condensed Matter and Materials Physics. 1997 ; Vol. 55, No. 24.
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