中国物理B ›› 1995, Vol. 4 ›› Issue (3): 225-230.doi: 10.1088/1004-423X/4/3/009

• • 上一篇    

ELECTRONIC STRUCTURE OF THE T*-TYPE SUPERCONDUCTORS (Bi0.5Sr1.5)(Y, Ce)2Cu2Oy STUDIED BY PHOTOELECTRON SPECTROSCOPY

张永健1, 陈仙辉1, 曹烈兆1, 陈兆甲1, 朱警生2   

  1. (1)Department of Physic, University of Science and Technology of China, Hefei 230026, China; (2)Laboratory of Structure Analysis, University of Science and Technology of China, Hefei 230026, China
  • 收稿日期:1994-01-03 出版日期:1995-03-20 发布日期:1995-03-20

ELECTRONIC STRUCTURE OF THE T*-TYPE SUPERCONDUCTORS (Bi0.5Sr1.5)(Y, Ce)2Cu2Oy STUDIED BY PHOTOELECTRON SPECTROSCOPY

ZHANG YONG-JIAN (张永健)a, CHEN XIAN-HUI (陈仙辉)a, CAO LIE-ZHAO (曹烈兆)a, CHEN ZHAO-JIA (陈兆甲)a, ZHU JING-SHENG (朱警生)b   

  1. a Department of Physic, University of Science and Technology of China, Hefei 230026, China; b Laboratory of Structure Analysis, University of Science and Technology of China, Hefei 230026, China
  • Received:1994-01-03 Online:1995-03-20 Published:1995-03-20

摘要: The electronic structure of T*-type compounds (Bi0.5Sr1.5)(Y2-xCex)Cu2Oy has been studied by X-ray photoelectron spectroscopy. From analysis of the results, it was found that cation deficiency in Ce4+ introduced holes to conduction planes in the T* phase as in the p-type infinite layer compounds. Some Cu ions in the sample without cation-deficiency contained two-oxygen coordination, which resulted in the incompleteness of the CuO2 sheets. Bi ions in the T* phase cuprates take exact valence of 3+, Pb ions cannot replace them due to the too large an ionic radius of Pb2+/Pb4+.

Abstract: The electronic structure of T*-type compounds (Bi0.5Sr1.5)(Y2-xCex)Cu2Oy has been studied by X-ray photoelectron spectroscopy. From analysis of the results, it was found that cation deficiency in Ce4+ introduced holes to conduction planes in the T* phase as in the p-type infinite layer compounds. Some Cu ions in the sample without cation-deficiency contained two-oxygen coordination, which resulted in the incompleteness of the CuO2 sheets. Bi ions in the T* phase cuprates take exact valence of 3+, Pb ions cannot replace them due to the too large an ionic radius of Pb2+/Pb4+.

中图分类号:  (Electronic structure (photoemission, etc.))

  • 74.25.Jb
79.60.-i (Photoemission and photoelectron spectra) 61.72.J- (Point defects and defect clusters)