Metal-insulator transition in NiS2-xSex: chemical vs external pressure effects (Articolo in rivista)

Type
Label
  • Metal-insulator transition in NiS2-xSex: chemical vs external pressure effects (Articolo in rivista) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1080/08957959.2010.516826 (literal)
Alternative label
  • Marini, C.; Valentini, M.; Perucchi, A.; Dore, P.; Sarma, D. D.; Lupi, S.; Postorino, P. (2011)
    Metal-insulator transition in NiS2-xSex: chemical vs external pressure effects
    in High pressure research
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Marini, C.; Valentini, M.; Perucchi, A.; Dore, P.; Sarma, D. D.; Lupi, S.; Postorino, P. (literal)
Pagina inizio
  • 18 (literal)
Pagina fine
  • 22 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 31 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 5 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 1 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • European Synchrotron Radiat Facil; Consiglio Nazionale delle Ricerche (CNR); Sapienza University Rome; Sincrotrone Trieste; Consiglio Nazionale delle Ricerche (CNR); Indian Association for the Cultivation of Science (literal)
Titolo
  • Metal-insulator transition in NiS2-xSex: chemical vs external pressure effects (literal)
Abstract
  • The Se alloying (x)- and the pressure (P)-induced metal-insulator transitions on the strongly correlated NiS2-xSex system have been investigated through Raman and infrared (IR) spectroscopies. Raman and IR responses of NiS2 to lattice compression are correlated to a metallization transition, occurring at 4GPa. This result suggests a strong interaction between lattice and electronic degrees of freedom. In particular, IR measurements carried out by applying P on NiS2 (i.e. lattice contraction) and on Se alloying (i.e. lattice expansion) reveal that in both cases a metallic state is obtained. Our optical spectroscopy results deviate from the idea of a simple scaling factor between P and x previously claimed by transport measurements, but, on the contrary, point out the substantially different microscopic origin of the two transitions. (literal)
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