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American Physical Society, Physical Review Letters, 7(93), 2004

DOI: 10.1103/physrevlett.93.076404

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Filling of the Mott-Hubbard gap in the high temperature photoemission spectrum of (V_0.972Cr_0.028)_2O_3

Journal article published in 2004 by S.-K. Mo ORCID, 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
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Abstract

The property of Mott-Hubbard (MH) insulator in photoemission spectra of paramagnetic insulating phase of (V0.972Cr0.028) 2O3, was analyzed. Multiple cycles of photoemission spectroscopy (PES) measurements from 300 to 800 K and back to 300 K were also performed in a VG ESCALAB MK-II system with photons. A single-crystalline sample of (V0.972Cr0.028)2O3 was placed with an embedded tungsten filament for heating on sample holder. The results show that crossover regime of the dynamical mean-field theory (DMFT) provides a unified picture of high-T resistivity behavior and high-T paramagnetic insulating (PI) phase PES spectra.