Lattice instability of 1 T -TiSe 2 is studied on the basis of the electronic band structure of this compound obtained by a tight-binding fit to the Zunger and Freeman's band. The electronic susceptibility, for which the wave number dependence of electron-lattice matrix elements is taken into account, is calculated for several phonon modes of wave vectors at the M and L points in the Brillouin zone. The results are discussed in connection with the lattice instability.
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Yoshida et al. (1980) studied this question.
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