XPS Study on the Electronic Structure of Bi_2Sr_2Ca_<1-x>Nd_xCu_2O_y
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概要
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XPS core level and valence band spectra of sintered Bi_2Sr_2Ca_<1-x>Nd_xCu_2O_y which manifests a superconducting to semiconducting phase change around x=0.5 have been measured. The fraction of Cu^<1+> to the total Cu ions evaluated from Cu2p spectra amounts to 7% in Bi_2Sr_2CaCu_2O_y, but decreases to 0% with increasing Nd content. From Ca2p, Sr3d, Nd3d, Bi4f and O1s spectra, it is inferred that Ca^<2+> and Sr^<2+> are mixed and distributed over both Ca and SrO layers, whereas Nd^<3+> and Sr^<2+> are rather separate. From the valence band spectra, a finite density of states at E_F is deduced for Ca-rich oxides, but it diminishes in Bi_2Sr_2NdCu_2O_y. The analysis of ionic configurations based on the mixed valencies of copper and oxygen ions gives a consistent account of the above spectra and the superconductor to semiconductor transition.
- 社団法人応用物理学会の論文
- 1990-09-20
著者
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NOGUCHI Seiichiro
Department of Applied Physics,Faculty of Engineering,Nagoya University
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Koyama Kuniyuki
Technology Development Center Toyohashi University Of Technology
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Tanaka Kazuhide
Department Metallurgical Engineering Nagoya Institute Of Technology
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Takaki Hiromu
Department Of Materials Science And Engineering Nagoya Institute Of Technology
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Noguchi Seiichiro
Department Of Applied Physics Faculty Of Engineering Nagoya University
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Tanaka Kazuhide
Department of Materials Science and Engineering, Nagoya Institute of Technology
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