Raman scattering study of Cu(Ge1-xSix)O3

Norio Ogita, Yasuhiro Tsunezumi, Jun Akimitsu, Masayuki Udagawa

Research output: Contribution to journalConference article

Abstract

Temperature and magnetic field dependence of Raman scattering spectra of Cu(Ge1-xSix)O3 has been measured for x = 0, 0.005, 0.008, 0.01, 0.015 and 0.02. For x≠0, zone-folded phonons due to the unit cell doubling appear at higher temperature (Tl) than the spin-Peierls transition temperature (TSP) and Tl increases with an increase of x. The coupling between magnetic fluctuation and phonon is estimated from the peak at about 100 cm-1 using the Fano formula, and the obtained coupling is almost independent of x. These results show that the suppression of TSP by Si-doping is mainly caused by the dimensional change of the magnetic interactions from one to three dimensions. The magnetic field dependence clarifies that the peak at 30 cm-1 is the soft phonon mode, not the SP gap excitation.

Original languageEnglish
Pages (from-to)832-834
Number of pages3
JournalPhysica B: Condensed Matter
Volume263-264
DOIs
Publication statusPublished - Mar 1999
Externally publishedYes
EventProceedings of the 1998 9th International Conference on Phonon Scattering in Condensed Matter, PHONONS 98 - Lancaster, Great Britain
Duration: Jul 26 1998Jul 31 1998

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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