Effects of nonstoichiometry, ordering, and Bi substitution with Pb in Bi2Sr2CaCu2O8

L. Szunyogh, G. Hörmandinger, P. Weinberger

Research output: Contribution to journalArticle


The fully relativistic real-space scattering cluster coherent-potential approximation is applied to Bi2Sr2CaCu2O8- for 00.5 with respect to each oxygen sublattice and to (Bi1-xPbx)2Sr2CaCu2O8 for 0x0.25. Increasing F was found as the vacancy content increases, while n(F) is decreased by disorder in the O(1) sublattice (Cu-O layers) and increased due to vacancies in the O(2) sublattice (Bi-O layers). As in the Y-Ba-Cu-O system, the effective oxygen-oxygen pair interactions in the Cu-O plane indicate the creation of isolated' Cu ions. By doping' the Bi sublattice with Pb, F drops and n(F) increases. From the effective Bi-Bi pair interactions an (antilikewise) ordering of Bi and Pb atoms can be deduced. Calculated x-ray-emission and uv-photoemission intensities for the nonstoichiometric system are presented.

Original languageEnglish
Pages (from-to)13025-13031
Number of pages7
JournalPhysical Review B
Issue number16
Publication statusPublished - Jan 1 1991

ASJC Scopus subject areas

  • Condensed Matter Physics

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