Vanadium dioxide : A Peierls-Mott insulator stable against disorder
  Vanadium dioxide undergoes a first order metal-insulator transition at 340 K. In this work, we develop and carry out state of the art linear scaling DFT calculations refined with non-local dynamical mean-field theory. We identify a complex mechanism, a Peierls-assisted orbital selection Mott instability, which is responsible for the insulating M$_1$ phase, and furthermore survives a moderate degree of disorder. 
Cedric Weber, David D. O'Regan, Nicholas D. M. Hine, Mike C. Payne,   Gabriel Kotliar, Peter B. Littlewood
cond-mat.str-el cond-mat.mtrl-sci