P. Schilbe

Raman scattering in VO2

Physica B 316-317, p. 600 (2002)


VO2 shows a metal insulator transition at 339 K. Despite intense experimental and theoretical investigations the nature of this transition is not clear until now. Proposed mechanisms for the phase transition are for example a Mott-Hubbard transition or a Peierls transition. To understand the structural part of the phase transition it is necessary to investigate the vibrational excitations. Although there have been a number of experimental investigations of the lattice vibrations of VO2 they resulted in sometimes conflicting or unclear results. Therefore, we studied the lattice vibrations of VO2 in the semiconducting and metallic phase with Raman spectroscopy again to gain more insight in the nature of the lattice vibrations.