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

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S. Suga P. Metcalf K. Held

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classification ❄️ cond-mat.str-el

keywords highmott-hubbardphotoemissiontemperaturetheoryagreementapproximationband

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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.

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

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