@article{oai:muroran-it.repo.nii.ac.jp:00006915,
 author = {TAKUBO, K. and MIZOKAWA, T. and MATSUMOTO, N. and Nagata,  Shoichi and 永田, 正一},
 issue = {24},
 journal = {Physical review. Third series. B, Condensed matter and materials physics},
 month = {Dec},
 note = {application/pdf, We have studied disorder-induced in-gap states and effect of light illumination in the insulating phase of spinel-type CuIr2S4 using ultraviolet photoemission spectroscopy (UPS) . The Ir3+ / Ir4+ charge-ordered gap appears below the metal-insulator transition temperature. However, in the insulating phase, in-gap spectral features with softgap are observed in UPS just below the Fermi level (EF), corresponding to the variable range hopping transport observed in resistivity. The spectral weight at EF is not increased by light illumination, indicating that the Ir4+-Ir4+ dimer is very robust, although the long-range octamer order would be destructed by the photoexcitation. Present results suggest that the Ir4+-Ir4+ bipolaronic hopping and disorder effects are responsible for the conductivity of CuIr2S4.},
 pages = {245117-1--245117-7},
 title = {In-gap state and effect of light illumination in CuIr2S4 probed by photoemission spectroscopy},
 volume = {78},
 year = {2008},
 yomi = {ナガタ, ショウイチ}
}