Interchain coupling and the Peierls transition in linear-chain systems

B. Horovitz, H. Gutfreund, M. Weger

Research output: Contribution to journalArticlepeer-review

162 Scopus citations

Abstract

We study the effect of interchain coupling on the Peierls transition temperature TP for a model with a nonplanar Fermi surface. Using the standard electron-phonon coupling, we show that the soft mode which causes the transition should have a wave vector q0=(πa,πa,2pF). We evaluate the effect of interchain coupling on TP within the mean-field theory, as well as the effect of fluctuations. Both these effects reduce TP, but we find that there is a range of interchain coupling where this reduction, due to both effects, is small. Neutron-scattering cross section and fluctuation contribution to the specific heat are evaluated. Comparison is made with experiments on K2Pt(CN)4Br0.3•3H2O (KCP) and tetrathiofulvalene-tetracyanoquinodimethan (TTF-TCNQ).

Original languageEnglish
Pages (from-to)3174-3185
Number of pages12
JournalPhysical Review B
Volume12
Issue number8
DOIs
StatePublished - 1 Jan 1975
Externally publishedYes

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