Re-induced raman active modes in HgBa2Can-1CunO2n+2+δ compounds

N. Poulakis, D. Lampakis, E. Liarokapis, Akira Yoshikawa, Jun Ich Shimoyama, Kohji Kishio, G. B. Peacock, J. P. Hodges, I. Gameson, P. P. Edwards, C. Panagopoulos

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A comparative Raman study of Re-free and Re-doped HgBa2Can-1CunO2n+2+δ with n = 1,3,4,5 is presented in an attempt to further clarify the structural and phononic modifications brought about by Re substitution. A number of extra high-frequency phonon peaks show up in the spectra of the Re-doped samples and are attributed to the oxygen modes of a strongly bound, almost decoupled ReO6 octahedron. As regards the apex oxygen in the Hg site, a clear transfer of spectral weight from the 590 to the 570 cm− 1 apex phonon band is observed upon Re substitution. Such a change may well be accounted for assuming increased excess oxygen content for the Re-doped samples. Another interesting result is the enhancement upon Re doping of a narrow peak probably attributed to c-axis vibrations of Ba whose frequency shows a distinctive change with the number n of the CuO2 layers, providing an easy way to identify the various phases in a sample.

Original languageEnglish
Pages (from-to)3244-3251
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume60
Issue number5
DOIs
Publication statusPublished - 1999

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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