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

页数：4