Filling of the Mott-Hubbard gap in the high temperature photoemission spectrum of (V0.972Cr0.028)2O3
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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