Direct observation of the pressure-induced charge redistribution in BiNiO3 by x-ray absorption spectroscopy

被引:31
|
作者
Mizumaki, Masaichiro [1 ]
Ishimatsu, Naoki [2 ]
Kawamura, Naomi [1 ]
Azuma, Masaki [3 ]
Shimakawa, Yuichi [3 ]
Takano, Mikio [3 ]
Uozumi, Takayuki [4 ]
机构
[1] Japan Synchrotron Radiat Res Inst, Sayo, Hyogo 6795198, Japan
[2] Hiroshima Univ, Dept Phys Sci, Grad Sch Sci, Hiroshima 7398526, Japan
[3] Kyoto Univ, Inst Chem Res, Kyoto 6110011, Japan
[4] Osaka Prefecture Univ, Osaka 5998531, Japan
来源
PHYSICAL REVIEW B | 2009年 / 80卷 / 23期
关键词
bismuth compounds; charge exchange; chemical analysis; electronic structure; metal-insulator transition; X-ray absorption spectra; ELECTRONIC-STRUCTURE; CRYSTAL-STRUCTURE; RNIO3; R; TRANSITION; PHOTOEMISSION; DIFFRACTION; PEROVSKITE; PRNIO3; GAP;
D O I
10.1103/PhysRevB.80.233104
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
To investigate the change in the electronic structure of BiNiO3 accompanied by metal-insulator (MI) transition, we measured x-ray absorption spectroscopy (XAS) spectra at the Ni K and Bi L edges under various pressures up to 6 GPa. Both Bi L-3 and Ni K edge XAS spectra clearly change at 4 GPa, indicating the electronic state in Bi and Ni ion changes. A quantitative analysis of the Ni K edge spectra in the pre-edge region based on the charge-transfer cluster model including multiplet terms revealed that the electronic configuration changes from d(8) in the insulating phase to 56% d(7)+44% d(8)L_ in the metal phase. From these results, we concluded that the MI transition in BiNiO3 is induced by the collapse of charge-transfer gap and is governed by the redistribution of O 2p ligand holes.
引用
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页数:4
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