Abstract
Analysis of the optical reflectivity spectra of TiSe2 at room temperature shows that the lattice polarizabilitye t * as well as the electronic polarizability ɛ∞ are unusually large. This suggests to us that the phase transition atT 0=200 K is a phonon-driven antiferroelectric transition. The properties of such a soft-mode transition in a semi-metal are investigated. It is found that excess carriers suppress the transition and that the excess resistivity at the transition varies as |T−T 0|−1.
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