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(Bi,Cd)Sr₂（Ln,Ce）_nCu₂O_y超导体及界面反应的光电子能谱研究

PHOTOELECTRON SPECTROSCOPY STUDIES FOR SUPERCONDUCTORS （Bi,Cd）Sr₂（Ln,Ce）nCu₂Oy AND THE INTERFACE REACTION

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【Author】 CHEN XIAN-HUI ZHANG YONG-JIAN JIN DING QI BO-YUN CAO LIE-ZHAO CHEN ZHAO-LIA(Department of Physics, University of Science and Technology of China. Hefei 230026)ZHU JlNG-SHENG(Laboratory of Structure Analysis, University of Science and Technology of China. Hefei 230026)

【机构】中国科学技术大学物理系；中国科学技术大学结构和成分分析开放研究实验室合肥230026；合肥230026；合肥230026；

【摘要】用光电子能谱研究了（Bi.Cd）Sr₂（Ln,Ce）_?Cu₂O_y的电子结构,以及其与铝之间的反应.芯能级结果表明:（Bi,Cd）Sr₂（Ln,Ce）_?Cu₂O_y系列中n=1,2和3三种材料的结果基本一致,并且类似其它超导材料中相同元素的芯能级结果.在（Bi,Cd）Sr₂（Ln,Ce）_?Cu₂O_y与铝的界面处,铝与（Bi,Cd）Sr₂（Ln,Ce）_?Cu₂O_y中的元素发生强烈反应,Bi—O,Sr—O和Cu—O键受到破坏,铜的价态从+2变为+1,并且同时伴随着超导电性的消失.铝从超导材料中获取氧形成氧化铝.更多还原

【Abstract】 Electronic structure of superconductors (Bi,Cd)Sr2(Ln,Ce) Cu2O7 and interface characteristics between contact material aluminium and these superconductors were studied. Core level results show that the three materials with n= 1,2,3 have nearly the same spectra which are similar to core level spectra of the interface between Al and (Bi,Cd)Sr2(Ln,Ce) Cu2Oy, Aluminium strongly reacts with all elements, disrupting Bi-O, Sr-O and Cu-O bonds with a loss of superconductivity at the surface. The valence of copper changes from 2+ to 1+ as a result of aluminium adatoms, and aluminium takes oxygen from the superconducting materials and forms aluminium oxide.更多还原