Abstract
The metal-insulator transition and unconventional metallic transport in vanadium dioxide are investigated with a combination of spectroscopic ellipsometry and reflectance measurements. The data indicate that electronic correlations, not electron-phonon interactions, govern charge dynamics in the metallic state of . This study focuses on the frequency and temperature dependence of the conductivity in the regime of extremely short mean free path violating the Ioffe-Regel-Mott limit of metallic transport. The standard quasiparticle picture of charge conduction is found to be untenable in metallic .
- Received 1 September 2006
DOI:https://doi.org/10.1103/PhysRevB.74.205118
©2006 American Physical Society