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Phys. Rev. Lett. 93, 076404 (2004) [4 pages]

Filling of the Mott-Hubbard Gap in the High Temperature Photoemission Spectrum of (V0.972Cr0.028)2O3

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S.-K. Mo1, H.-D. Kim2, J. W. Allen1, G.-H. Gweon1,*, 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

Received 23 February 2004; published 12 August 2004

Photoemission spectra of the paramagnetic insulating phase of (V0.972Cr0.028)2O3, 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.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.076404
DOI:
10.1103/PhysRevLett.93.076404
PACS:
71.27.+a, 71.30.+h, 79.60.–i

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

 
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