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

S. Sugai*, M. Sato, S. Kurihara

*この研究の対応する著者

研究成果: Article査読

21 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)6809-6818
ページ数10
ジャーナルPhysical Review B
32
10
DOI
出版ステータスPublished - 1985
外部発表はい

ASJC Scopus subject areas

  • 凝縮系物理学

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