Interphonon interactions at the charge-density-wave phase transitions in (TaSe4)2I and (NbSe4)2I

S. Sugai, M. Sato, S. Kurihara

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Lattice vibrations in the quasi-one-dimensional charge-density-wave (CDW) system (MSe4)nI are investigated by Raman scattering in the (TaSe4)2I and (NbSe4)2I compounds. The existence of three CDW-related TO modes is found in this experiment, and the following model for the CDW transition is proposed. The compounds of this system have strong interaction between the Kohn-anomaly TO mode and the TA mode, both of which are on the same branch in the extended Brillouin zone of the MSe4 unit. As a consequence of the interaction, the TA mode condenses prior to the Kohn-anomaly TO mode. The theory of the CDW phase transition in the coupled system is presented.

Original languageEnglish
Pages (from-to)6809-6818
Number of pages10
JournalPhysical Review B
Volume32
Issue number10
DOIs
Publication statusPublished - 1985
Externally publishedYes

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Charge density waves
Phase transitions
interactions
Lattice vibrations
anomalies
Raman scattering
lattice vibrations
Brillouin zones
Raman spectra
Experiments

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Interphonon interactions at the charge-density-wave phase transitions in (TaSe4)2I and (NbSe4)2I. / Sugai, S.; Sato, M.; Kurihara, S.

In: Physical Review B, Vol. 32, No. 10, 1985, p. 6809-6818.

Research output: Contribution to journalArticle

Sugai, S. ; Sato, M. ; Kurihara, S. / Interphonon interactions at the charge-density-wave phase transitions in (TaSe4)2I and (NbSe4)2I. In: Physical Review B. 1985 ; Vol. 32, No. 10. pp. 6809-6818.
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