Studies of the Cu-O bond in (Pb, Cd)-1212 and (Pb, Cd)-1201 cuprates by X-ray photoelectron spectroscopy

W. J. Yu, Z. Q. Mao, M. L. Tian, Y. Wang, G. E. Zhou, Y. H. Zhang

Research output: Contribution to journalArticle

Abstract

It is shown that in (Pb0.5Cd0.5)Sr2(Y0.5Ca 0.5)Cu2O7 and (Pb0.5Cd0.5)SrLaCuO5 cuprates, where Cu2+ ions are in pyramidal and octahedral geometry with five and six neighboring oxygens, respectively, the Cu2p3/2(2p53d10L) XPS core line is broader than that in Nd2CuO4 where Cu2+ ions are in a square planar geometry with four coordination oxygen ions, and that for (Pb0.5Cd0.5)SrLaCuO5 is the broadest. To explain these changes in the XPS Cu2p3/2 main line, two different charge transfer mechanisms from the O2p to the Cu3d orbitals are considered. For the square planar geometry (CuO4) only the O2px, y → Cu3dx2-y2 charge transfer is allowed, whereas for pyramidal and octahedral geometries an additional apical O2pz → Cu3d3z2-r2 transition could take place, and in octahedral geometry the latter transition is more significant. The valence band spectra of the cuprates also confirm this proposition.

Original languageEnglish (US)
Pages (from-to)151-154
Number of pages4
JournalPhysica Status Solidi (B) Basic Research
Volume193
Issue number1
DOIs
StatePublished - Jan 1996

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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