Raman Scattering Study of Phonon and Magnetic Excitations along the Magnetic Chain in CuGeO3

Norio Ogita, Tsutomu Minami, Yoshifumi Tanimoto, Osamu Fujita, Jun Akimitsu, Peter Lemmens, Gernot Güntherodt, Masayuki Udagawa

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13 Citations (Scopus)

Abstract

Detailed temperature dependence of (c, c) Raman scattering spectra has been measured for CuGeO3 in the vicinity of spin-Peierls transition temperature (Tsp). Below Tsp, six peaks at 30, 105, 227, 370, 416, and 817 cm-1 have been observed. We newly observed a peak at 416 cm-1. The energy of the 30 cm-1 peak decreases continuously with increasing temperature and becomes zero above Tsp. The peak at 30 cm-1 is assigned as the soft mode in the spin-Peierls phase from the agreement with the temperature dependence of the super-lattice reflection intensity. The peak at 227 cm-1 is assigned as a two-magnon along the c-axis (Cu chain direction). The peaks at 370, 416, and 817 cm-1 are assigned as the phonons, which appear by the symmetry change. The new peaks of (c, c) are not sensitive to the magnetic field along the a-axis below 9 T at 4.7 K.

Original languageEnglish
Pages (from-to)3754-3757
Number of pages4
Journaljournal of the physical society of japan
Volume65
Issue number12
DOIs
Publication statusPublished - Jan 1 1996
Externally publishedYes

Keywords

  • CuGeO
  • Lattice dimerization
  • Magnetic excitation
  • Raman scattering
  • Spin-Peierls transition

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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