The effects of Co substitutions for Cu in YBa2Cu3O6+x on the phonon Raman spectrum

L. Börjesson, L. Van Hong, M. Käll, M. Kakihana, P. Berastegui

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We have investigated the phonon Raman spectra of YBa2Cu3-xCoxO7-δ ceramic samples prepared by both solid state reaction and a polymerized complex method using Raman microprobe collection optics. With increasing Co content the frequencies of the Ba, Cu(2), O(2)-O(3) and the apical oxygen O(4) c-axis vibrational modes change considerably. The changes are compared with changes of interatomic bond distances as obtained by neutron diffraction and indicate charge transfer effects between the CuO2 planes and the CuO chains with increasing Co substitution. The CuO2 plane oxygen mode at 336 cm-1 exhibits slightly decreased coupling to the electronic states with increasing Co content.

Original languageEnglish
Pages (from-to)363-366
Number of pages4
JournalJournal of Alloys and Compounds
Volume195
Issue numberC
DOIs
Publication statusPublished - 1993 May 10

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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