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题名: Optical study of the metal-insulator transition in CuIr2S4 crystals
作者: Wang, NL ;  Cao, GH ;  Zheng, P ;  Li, G ;  Fang, Z ;  Xiang, T ;  Kitazawa, H ;  Matsumoto, T
刊名: PHYSICAL REVIEW B
出版日期: 2004
卷号: 69, 期号:15, 页码:-
关键词: THIOSPINEL CUIR2S4 ;  SYSTEM ;  SUPERCONDUCTIVITY ;  CU1-XZNXIR2S4 ;  CONDUCTION ;  MAGNETITE
学科分类: Physics
通讯作者: Wang, NL , Chinese Acad Sci, Inst Phys, POB 603, Beijing 100080, Peoples R China.
部门归属: Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China; Chinese Acad Sci, Ctr Condensed Matter Phys, Beijing 100080, Peoples R China; Zhejiang Univ, Dept Phys, Hangzhou 310027, Peoples R China; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; Chinese Acad Sci, Interdisciplinary Ctr Theoret Studies, Beijing 100080, Peoples R China; Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan
英文摘要: We present measurements of the optical spectra on single crystals of spinel-type compound CuIr2S4. This material undergoes a sharp metal-insulator transition at 230 K. Upon entering the insulating state, the optical conductivity shows an abrupt spectral weight transfer and an optical excitation gap opens. In the metallic phase, Drude components in low frequencies and an interband transition peak at similar to2 eV are observed. In the insulating phase, a peak emerges around 0.5 eV. This peak is attributed to the transition of electrons from the occupied Ir3+ t(2g) state to upper Ir4+ t(2g) subband resulting from the dimerization of Ir4+ ions in association with the simultaneous formations of Ir3+ and Ir4+ octamers as recently revealed by the x-ray-diffraction- experiment. Our experiments indicate that the band structure is reconstructed in the insulating phase due to the sudden structural transition.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000221426800004
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/14101
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Wang, NL,Cao, GH,Zheng, P,et al. Optical study of the metal-insulator transition in CuIr2S4 crystals[J]. PHYSICAL REVIEW B,2004,69(15):-.
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