Abstract
For 15 years, structural studies have played a role in the physics of one dimensional (1D) conductors. The reason is that most of these materials exhibit low temperature periodic lattice distortions (PLD) related to instabilities of the 1D electronic gas. The underlying physical mechanism was found by Peierls more than 30 years ago: a 1D metal, of ρ independent electrons per unit cell, is unstable, at T = OK, with respect to a periodic modulation of wave vector 2kF (ρ = 2 × 2kF) opening a gap at ± kF in the electronic structure (fig. 1a). In the Peierls-Fröhlich approach, the electron phonon coupling connects the intrachain displacive modulation and the electronic instability in the formation of a 2kF charge density wave (CDW). But it is conceivable that other interactions of the electron gas, like its Coulomb coupling with orientational or positional (ionic) degrees of freedom, external to the chain, are able to stabilize a 2kF lattice periodicity.
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Pouget, J.P. (1987). Structural Instabilities of One-Dimensional Conductors. In: Jérome, D., Caron, L.G. (eds) Low-Dimensional Conductors and Superconductors. NATO ASI Series, vol 155. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-3611-0_2
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