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Core-level X-ray photoemission studies of Bi2Sr2Ca1−xEuitxCu2Oy

✍ Scribed by B.R. Sekhar; P. Srivastava; N.L. Saini; K.V.R. Rao; S.K. Sharma; K.B. Garg; S.K. Agarwal; V.P.S. Awana; A.V. Narlikar

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
597 KB
Volume
206
Category
Article
ISSN
0921-4534

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✦ Synopsis

A well-characterized Eu-doped Bi2Sr2Ca~_xEuxCu2Oy (x=0 to 1 ) system has been studied using core-level photoemission. The trivalent Eu is found to be incorporated into the lattice, causing an increase in the valence states ofBi, Sr and Ca and a decrease in the Cu valence. The observed superconductor-insulator transition in this system is found to be caused by an enhanced insulating nature of the Bi-O planes and a decrease in the O 2p hole concentration in the Cu-O planes. The results of Sr 3d, Ca 2p, Cu 2p and Bi 4f core-level spectra are discussed in detail.

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✍ Y. Fukuda; K. Terashima; Y. Nakanishi; T. Suzuki; M. Nagoshi; Y. Syono; M. Tachi 📂 Article 📅 1989 🏛 Elsevier Science 🌐 English ⚖ 116 KB

Core-level and valence-band electronic structures of Bi2Sr2Cal-xYxCu2Oy (x=0,O.4, and 0.7) have been studied by X-ray and UV photoemlsslon spectroscopy. A Fermi edge is observed for x=0.4 as well as for x=0. It is found that the density of states at the Fermi level and the intensity of a 1.2-eV peak