X-ray photoemission study of CuIr2S4

Ir3+-Ir4+ charge ordering and the effect of light illumination

K. Takubo, S. Hirata, J. Y. Son, J. W. Quilty, Takashi Mizokawa, N. Matsumoto, S. Nagata

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

We have studied the electronic structure of the spinel-type compound CuIr2S4 using x-ray photoemission spectroscopy (XPS). CuIr2S4 undergoes a metal-insulator transition (MIT) at â226K. In going from the metallic to insulating states, the valence-band photoemission spectrum shows a gap opening at the Fermi level and a rigid-band shift of â0.15eV. In addition, the Ir 4f core-level spectrum is dramatically changed by the MIT. The Ir 4f line shape of the insulating state can be decomposed into two contributions, consistent with the charge disproportionation of Ir3+â¶Ir4+=1â¶1. XPS measurements under laser irradiation indicate that the charge disproportionation of CuIr2S4 is very robust against photo-excitation in contrast to Cs2Au2Br6 which shows photo-induced valence transition.

Original languageEnglish
Article number246401
JournalPhysical Review Letters
Volume95
Issue number24
DOIs
Publication statusPublished - 2005 Dec 9
Externally publishedYes

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photoelectric emission
illumination
insulators
valence
x rays
photoexcitation
metals
spectroscopy
spinel
line shape
electronic structure
irradiation
shift
lasers

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

X-ray photoemission study of CuIr2S4 : Ir3+-Ir4+ charge ordering and the effect of light illumination. / Takubo, K.; Hirata, S.; Son, J. Y.; Quilty, J. W.; Mizokawa, Takashi; Matsumoto, N.; Nagata, S.

In: Physical Review Letters, Vol. 95, No. 24, 246401, 09.12.2005.

Research output: Contribution to journalArticle

Takubo, K. ; Hirata, S. ; Son, J. Y. ; Quilty, J. W. ; Mizokawa, Takashi ; Matsumoto, N. ; Nagata, S. / X-ray photoemission study of CuIr2S4 : Ir3+-Ir4+ charge ordering and the effect of light illumination. In: Physical Review Letters. 2005 ; Vol. 95, No. 24.
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AU - Matsumoto, N.

AU - Nagata, S.

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