Characterization of Co-Substituted YBa2Cu3O7-d Superconductors by Raman Spectroscopy —Application of Raman Spectroscopy to High-Tc Superconductors (1)—

Masato Kakihana, Hirotaka Fujimori, Masatomo Yashima, Masahiro Yoshimura, Hiromasa Mazaki, Hiroshi Yasuoka

Research output: Contribution to journalArticlepeer-review

Abstract

We have investigated the phonon Raman spectra of YBa2Cu3-xCoxO7-d ceramic samples prepared by a polymerized complex method using Raman microprobe collection optics. Defect induced Raman scattering from Cu(1)-O(1) chains has been observed in Co-substituted samples, suggesting that Co predominantly enters the chain site. With increasing Co content the frequencies of the Ba, Cu(2), 0(2)-0(3) and the apex oxygen 0(4) vibrational modes along caxis change considerably. The changes are compared with those of interatomic bond distances as obtained by neutron diffraction and they indicate charge transfer effects between the CuO chain and the CuO2 planes with increasing Co substitution. It is suggested that the O(4) mode is sensitive to small changes of the charge balance between the chain and the plane.

Original languageEnglish
Pages (from-to)1101-1106
Number of pages6
Journaljournal of the japan society of powder and powder metallurgy
Volume40
Issue number11
DOIs
Publication statusPublished - 1993 Jan 1

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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