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; T. Mizokawa; N. Matsumoto; S. Nagata

doi:10.1103/PhysRevLett.95.246401

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, T. Mizokawa, N. Matsumoto, S. Nagata

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

38 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 language	English
Article number	246401
Journal	Physical Review Letters
Volume	95
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevLett.95.246401
Publication status	Published - 2005 Dec 9
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.95.246401

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title = "X-ray photoemission study of CuIr2S4:Ir3+-Ir4+ charge ordering and the effect of light illumination",

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 {\^a}226K. 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 {\^a}0.15eV. 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+{\^a}¶Ir4+=1{\^a}¶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.",

author = "K. Takubo and S. Hirata and Son, {J. Y.} and Quilty, {J. W.} and T. Mizokawa and N. Matsumoto and S. Nagata",

year = "2005",

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T1 - X-ray photoemission study of CuIr2S4:Ir3+-Ir4+ charge ordering and the effect of light illumination

AU - Takubo, K.

AU - Hirata, S.

AU - Son, J. Y.

AU - Quilty, J. W.

AU - Mizokawa, T.

AU - Matsumoto, N.

AU - Nagata, S.

PY - 2005/12/9

Y1 - 2005/12/9

N2 - 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.

AB - 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.

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X-ray photoemission study of CuIr2S4:Ir3+-Ir4+ charge ordering and the effect of light illumination

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