Charge disproportionation in quasi-one-dimensional vanadium oxides

Ma  C; Yang  HX; Li  ZAUeda  YLi  JQ

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Charge disproportionation in quasi-one-dimensional vanadium oxides

机译：Charge disproportionation in quasi-one-dimensional vanadium oxides

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The vanadium bronzes beta (beta')-A(x)V(2)O(5) (A = Na+, Ag+, Ca2+, Cu+) are investigated by electron energy-loss spectroscopy (EELS), X-ray absorption near edge spectroscopy and electronic structure calculations. We analysed the fine structural features of experimental spectra in the lowloss region and the vanadium L-2.3 and oxygen K ionization edges in correlation with electronic structure of this quasi -one-di mens i onal conducting system. The different energy separations on the fine structures of the vanadium L-3 edge and oxygen K edge arising from ligand field splitting suaaest chame disproportionation occurring in beta (beta')-A(x)V(2)O(5) materials at room temperature. Based on the analysis of the highly-damped valence electron plasmon peak for these materials, the charge distribution among different chains and ladders is briefly discussed. (c) 2008 Elsevier Ltd. All rights reserved.

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《Solid State Communications》 |2008年第2期|30-34|共5页
作者
Ma C; Yang HX; Li ZAUeda YLi JQ;
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作者单位

Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100080, Peoples R China;

Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan;

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正文语种英语
中图分类固体物理学;
关键词
vanadium oxides; charge disproportionation; superconductivity; TRANSITION-METAL OXIDES; X-RAY-ABSORPTION; CRYSTAL-STRUCTURE; SUPERCONDUCTIVITY; SPECTROSCOPY; BRONZES; STATE; ORDER;

Charge disproportionation in quasi-one-dimensional vanadium oxides

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