X-ray studies of phonon softening in tise2

Phys Rev Lett. 2001 Apr 23;86(17):3799-802. doi: 10.1103/PhysRevLett.86.3799.


The charge-density-wave transition in TiSe (2), which results in a commensurate (2x2x2) superlattice at temperatures below approximately 200 K, presumably involves softening of a zone-boundary phonon mode. For the first time, this phonon-softening behavior has been examined over a wide temperature range by synchrotron x-ray thermal diffuse scattering.