Evidence for incipient O dimerization and absence of Cu+3 in temperature-dependent XPS of highTc superconducting oxides

Autor:	Kachel, T., Sen, P., Dauth, B., Campagna, M.
Zdroj:	Zeitschrift für Physik B Condensed Matter; June 1988, Vol. 70 Issue: 2 p137-139, 3p
Abstrakt:	From temperature-dependent X-ray photoemission (XPS) spectra between 300 and 10 K of Sr doped La2CuO4 and “123” compounds (YBa2Cu3O7-d) we deduce the absence of the Cu3d8(Cu3+) configuration in the ground state of these Mott insulators. The metallic character of these samples and involving those Cu atoms which are relevant for the superconducting properties arises from a(d9p6)+ß(d10p5) valence fluctuations, while the superconducting transition is indicated to be closely related to an incipient oxygen dimerization which is best detected upon cooling far belowTc.
Databáze:	Supplemental Index
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