Filling of the Mott-Hubbard gap in the high temperature photoemission   spectrum of (V_0.972Cr_0.028)_2O_3
  Photoemission spectra of the paramagnetic insulating (PI) phase of (V_0.972Cr_0.028)_2O_3, taken in ultra high vacuum up to the unusually high temperature (T) of 800 K, reveal a property unique to the Mott-Hubbard (MH) insulator and not observed previously. With increasing T the MH gap is filled by spectral weight transfer, in qualitative agreement with high-T theoretical calculations combining dynamical mean field theory and band theory in the local density approximation. 
S. -K. Mo, H. -D. Kim, J. W. Allen, G. -H. Gweon, J. D. Denlinger, J.   -H. Park, A. Sekiyama, A. Yamasaki, S. Suga, P. Metc...