Structural Analysis on T_c Variation of Bi_2Sr_<2-x>Ca_<1+x>Cu_2O_<8+y>
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概要
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The effects of heat treatment for Bi_2Sr_<2-x>Ca_<1+x>Cu_2O_<8+y> (x=0.25, 0.5, 0.75, 1.0) were studied by X-ray diffraction and Raman scattering measurements. The curve of T_c vs normal state conductivity ρ^<-1> is found to attain a maximum through heat treatment and a compositional change, suggesting the presence of an optimum hole concentration, as is observed in the La- and Y-based superconductors. In most cases, T_c decreases with an increase in ρ^<-1>, except for the sample with x=1.0. Furthermore, we found no peak shift of the 466 cm^<-1> Raman mode induced by the heat treatment and the compositional change, which are expected to vary the Bi-Cu distance.
- 社団法人応用物理学会の論文
- 1989-07-20
著者
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MORIMOTO Akiharu
Department of Electrical and Computer Engineering, Faculty of Engineering, Kanazawa University
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SHIMIZU Tatsuo
Department of Electrical and Computer Engineering, Faculty of Engineering, Kanazawa University
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Shimizu T
Chiba Univ. Chiba Jpn
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Moto Akihiro
The Authors Are With The Research Center For Superconductor Photonics Osaka University
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Moto Akihiro
Department Of Electrical And Electronic Engineering Kanazawa University
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Shimizu Tatsuo
Department Of Applied Physics University Of Tokyo
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Morimoto Akiharu
Department of Electrical and Computer Engineering, Faculty of Engineering,
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