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X‐ray photoelectron spectra of high T c bismuth compounds. General trends for layer structures
Author(s) -
Bocquet A. E.,
Dobson J. F.,
Healy P. C.,
Myhra S.,
Thompson J. G.
Publication year - 1989
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221520214
Subject(s) - bismuth , x ray photoelectron spectroscopy , alkaline earth metal , context (archaeology) , stoichiometry , metal , binding energy , superconductivity , spectral line , oxide , crystallography , chemistry , materials science , analytical chemistry (journal) , physics , condensed matter physics , atomic physics , nuclear magnetic resonance , geology , metallurgy , paleontology , astronomy , chromatography
Analysis by XPS and XAES has been carried out for Bi 2 Sr 2 CaCu 2 O 8 and Bi 2 Sr 2 CuO 6 HTSC compounds. Some preliminary results are also reported for a Tl specimen with predominant Tl 2 Ba 2 CaCu 2 O 8 stoichiometry, as well as La 0.6 Sr 0.4 CoO 3 which is a “metallic” oxide, but is not superconducting above 4.2 K. Anomalous low binding energy contributions are found for the main alkaline earth envelopes (Ba 3d, Ca 2p, and Sr 3d) for all of these compounds. Likewise, two distinct contributions to the O 1s envelope are observed. The Bi and Tl 4f envelopes and binding energies are consistent with these species being subject to metallic screening. Possible implications of these observations for the electronic structure of the layered HTSC oxides are discussed in the context of a “screening” as well as a “shake‐down” model.