Filling of the Mott-Hubbard Gap in the High Temperature Photoemission Spectrum of $({\mathrm{V}}_{0.972}{\mathrm{C}\mathrm{r}}_{0.028}{)}_{2}{\mathrm{O}}_{3}$

Filling of the Mott-Hubbard Gap in the High Temperature Photoemission Spectrum of $(V_{0.972} {C r}_{0.028})_{2} O_{3}$

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, and K. Held

Phys. Rev. Lett. 93, 076404 – Published 12 August 2004

Abstract

Photoemission spectra of the paramagnetic insulating phase of $(V_{0.972} {C r}_{0.028})_{2} O_{3}$ , taken in ultrahigh vacuum up to the unusually high temperature ( $T$ ) of 800 K, reveal a property unique to the Mott-Hubbard (MH) insulator that has not been 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.

Received 23 February 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.076404

Authors & Affiliations

S.-K. Mo¹, H.-D. Kim², J. W. Allen¹, G.-H. Gweon^1,*, J. D. Denlinger³, J.-H. Park⁴, A. Sekiyama⁵, A. Yamasaki⁵, S. Suga⁵, P. Metcalf⁶, and K. Held⁷

¹Randall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
²Pohang Accelerator Laboratory, Pohang 790-784, Korea
³Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
⁴Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
⁵Department of Material Physics, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
⁶Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA
⁷Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany

^*Current address: Lawrence Berkeley National Laboratory, Advanced Light Source, MS 7-100, 1 Cyclotron Road, Berkeley, CA, 94720, USA.

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Vol. 93, Iss. 7 — 13 August 2004

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Physical Review Letters

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, and K. Held

Phys. Rev. Lett. 93, 076404 – Published 12 August 2004

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Filling of the Mott-Hubbard Gap in the High Temperature Photoemission Spectrum of $(V_{0.972} {C r}_{0.028})_{2} O_{3}$