Comparative photoemission study of Bi2(Sr,Ca)3Cu2O8+y
and Bi1.7Pb0.3Sr2Ca2Cu3O10+y |
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| Authors: | Nanlin Wang Qirui Zhang Yugui Wang Mingrong Ji Xianming Liu |
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| Institution: | (1) Department of Physics, University of Science and Technology of China, 230026 Hefei, People's Republic of China;(2) Department of Physics, Zhejiang University, 310027 Hangzhou, People's Republic of China;(3) Institute of Plasma Physics, Academia Sinica, 230031 Hefei, People's Republic of China;(4) Center of Structure and Element Analysis, University of Science and Technology of China, 230026 Hefei, People's Republic of China |
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| Abstract: | The electronic structure of Bi-based 2223 single phase superconductor has been studied by ultraviolet and X-ray photoemission. By comparison with that of 2212 phase superconductor, we find a higher density of states nearE
F
for 2223 phase. From analysis of the Cu 2p core-level spectroscopy, we obtain a relatively smaller charge transfer energy between copper and oxygen as well as the Coulomb repulsion energy on Cu site for 2223 phase. We relate these changes to the increase of hole concentration from 2212 to 2223 phase. The experimental results support the viewpoint that the transition temperature should be correlated with the density of states atE
F
. |
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