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

School of Advanced Science and Engineering

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

31 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

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1103/PhysRevLett.95.246401

Fingerprint Dive into the research topics of 'X-ray photoemission study of CuIr2S4:Ir3+-Ir4+ charge ordering and the effect of light illumination'. Together they form a unique fingerprint.

Cite this

@article{9f35b5c8ea9d430fb596e818735e6653,

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",

month = dec,

day = "9",

doi = "10.1103/PhysRevLett.95.246401",

language = "English",

volume = "95",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "24",

}

TY - JOUR

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.

UR - http://www.scopus.com/inward/record.url?scp=28944446132&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=28944446132&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.95.246401

DO - 10.1103/PhysRevLett.95.246401

M3 - Article

AN - SCOPUS:28944446132

VL - 95

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 24

M1 - 246401

ER -