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Relevance of nonadiabatic effects in TiOCl

Authors
  • Mastrogiuseppe, Diego
  • Dobry, Ariel
Type
Published Article
Publication Date
May 27, 2009
Submission Date
May 27, 2009
Identifiers
DOI: 10.1088/1742-6596/200/2/022032
Source
arXiv
License
Yellow
External links

Abstract

We analyze the effect of the phonon dynamics on a recently proposed model for the uniform-incommensurate transition seen in TiOX compounds. The study is based on a recently developed formalism for nonadiabatic spin-Peierls systems based on bosonization and a mean field RPA approximation for the interchain coupling. To reproduce the measured low temperature spin gap, a spin-phonon coupling quite bigger than the one predicted from an adiabatic approach is required. This high value is compatible with the renormalization of the phonons in the high temperature phase seen in inelastic x-ray experiments. Our theory accounts for the temperature of the incommensurate transition and the value of the incommensurate wave vector at the transition point.

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