Lattice instabilities of 1 T -VSe 2 , CrSe 2 , and TiS 2 are studied on the basis of the band-type Jahn-Teller mechanism. The wave number and mode dependences of electron-lattice interaction and the generalized electronic susceptibility are calculated for each compound by using modified bands of 1 T -TiSe 2 . The results are discussed in connection with possible distortions.
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Yoshida et al. (1982) studied this question.
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