Abstract
The derivatives of the current-voltage characteristics of a homojunction point contact of 1T-CdI2-type layered crystal TiS2 and its intercalation compounds M1/4TiS2 (M=Mn, Fe, Co, and Ni) have been measured at 1.4 K. With reference to the available data on lattice dynamics, we have identified various inter- and intralayer acoustic and optical phonon modes. The acoustic phonon modes are strongly anisotropic compared with the optical ones in these materials. The variations of the acoustic phonon energies upon intercalation of 3d metals are strongly correlated with those of the interlayer spacingc, for which qualitative discussions are given.
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