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Effects of lattice fluctuations on the charge-density-wave transition in transition-metal dichalcogenides

Journal of Physics C: Solid State Physics, ISSN: 0022-3719, Vol: 19, Issue: 28, Page: 5591-5606
1986
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Effects of lattice fluctuations on the charge-density-wave transition are studied for a three-dimensional system on the basis of a two-band model. Using the thermal Green function method we calculate the polarisation function for phonons and the self-energy for electrons in the mode-mode coupling approximation. The renormalised phonon frequency and the lattice fluctuation are obtained self-consistently as functions of temperature. The coherence length is given in a concrete form. Taking lattice fluctuations into account, the electron density of states, spin susceptibility and electrical resistivity are calculated and compared with their anomalous temperature dependences observed in IT-TiSe2. © 1986 IOP Publishing Ltd.

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