LECTRONIC STRUCTURE STUDIES OF Bi2Sr2CaCu2-xSnxO8+$\delta$ SYSTEM
LI QI (李旗)ab, PAN HAI-BIN (潘海斌)b, ZHU CHUAN-GANG (祝传刚)b, XU PENG-SHOU (徐彭寿)b, ZHOU YING-XUE (周映雪)b, ZHANG XIN-YI (张新夷)b
a Technical Physics Department, Peking University, Beijing 10087l, China; b National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
Abstract Photoemission measurements have been carried out for Bi2Sr2CaCu2-xSnxO8+$\delta$ system with conventional x-ray photoemission spectroscopy for core-level spectra and synchrotron radiation photoemission spectroscopy for valence band. With Sn doping, all core levels shift differently in binding energy, and the intensity near fermi energy becomes smaller in valence hand. From the experiment, we can deduce that the shifts of all core levels and valence hands may involve some other mechanisms, such ms electrostatic effects, in addition to binding energy referencing effects. We argue that the chemical environment plays a crucial role in the electronic structure of high-temperature superconductors.
Received: 22 January 1999
Revised: 17 May 1999
Accepted manuscript online:
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