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Unoccupied electronic states in NiS2-xSex across the metal-insulator transition (Articolo in rivista)

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Label

Unoccupied electronic states in NiS2-xSex across the metal-insulator transition (Articolo in rivista) (literal)

Anno

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Alternative label

D.D. Sarma, M. Pedio, M. Capozi, A. Gyricky, Nirmala Chandrasekharan, N. Shanti, S. R. Krishnakumar, C. Ottaviani, C. Quaresima, P. Perfetti (1998)
Unoccupied electronic states in NiS2-xSex across the metal-insulator transition
in Physical review. B, Rapid communications (online); APS, American physical society, College Park, MD (Stati Uniti d'America)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

D.D. Sarma, M. Pedio, M. Capozi, A. Gyricky, Nirmala Chandrasekharan, N. Shanti, S. R. Krishnakumar, C. Ottaviani, C. Quaresima, P. Perfetti (literal)

Pagina inizio

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Rivista

Note

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Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India Istituto di Struttura della Materia, via Fosso del Cavaliere, I-00133, Italy (literal)

Titolo

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

Abstract

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. (literal)

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