Filling of the Mott-Hubbard gap in the high temperature photoemission spectrum of (V0.972Cr0.028)2O3
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. Metcalf, K. Held
Abstract
Photoemission spectra of the paramagnetic insulating (PI) phase of (V0.972Cr0.028)2O3, 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.
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