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Unoccupied electronic states in NiS2-xSex across the metal-insulator transition

Sarma, DD and Pedio, M and Capozi, M and Girycki, A and Chandrasekharan, Nirmala and Shanthi, N and Krishnakumar, SR and Ottaviani, C and Quaresima, C and Perfetti, P (1998) Unoccupied electronic states in NiS2-xSex across the metal-insulator transition. In: Physical Review B, 57 (12). pp. 6984-6988.

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Official URL: http://prola.aps.org/abstract/PRB/v57/i12/p6984_1


We investigate the evolution of the electronic structure across the insulator-metal transition in NiS2-xSex with changing composition, but in the absence of any structural or magnetic changes. A comparison of the inverse photoemission spectra with band-structure calculations establishes the importance of correlation effects in these systems. Systematic changes in the spectral distribution establish the persistence of the upper Hubbard band well into the metallic regime, with the insulator-to-metal transition being driven by a transfer of spectral weight from the Hubbard band to states close to the Fermi energy.

Item Type: Journal Article
Publication: Physical Review B
Publisher: American Physical Society
Additional Information: Copyright of this article belongs to American Physical Society.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 15 Dec 2009 12:31
Last Modified: 19 Sep 2010 05:28
URI: http://eprints.iisc.ac.in/id/eprint/19433

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