Combined Raman and infrared investigation of the insulator-to-metal transition in NiS(2-x)Se(x) compounds (Articolo in rivista)

Type
Label
  • Combined Raman and infrared investigation of the insulator-to-metal transition in NiS(2-x)Se(x) compounds (Articolo in rivista) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.84.235134 (literal)
Alternative label
  • C. Marini1,2; A. Perucchi2,3; D. Chermisi2; P. Dore4; M. Valentini2; D. Topwal5; D.D. Sarma5; S. Lupi2; P. Postorino2 (2011)
    Combined Raman and infrared investigation of the insulator-to-metal transition in NiS(2-x)Se(x) compounds
    in Physical review. B, Condensed matter and materials physics (Online)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • C. Marini1,2; A. Perucchi2,3; D. Chermisi2; P. Dore4; M. Valentini2; D. Topwal5; D.D. Sarma5; S. Lupi2; P. Postorino2 (literal)
Pagina inizio
  • 235134-1 (literal)
Pagina fine
  • 235134-1 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 84 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 6 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1 European Synchrotron Radiation Facility, 6 Rue Jules Horowitz, Boite Postale 220, F-38043 Grenoble Cedex, France 2 CNR-IOM and Dipartimento di Fisica, Universita' di Roma \"La Sapienza\", Piazzale Aldo Moro 2, I-00185 Roma, Italy 3 Sincrotrone Trieste S.C.p.A., Area Science Park, I-34012 Basovizza, Trieste, Italy 4 CNR-SPIN and Dipartimento di Fisica, Universit`a di Roma \"La Sapienza\", Piazzale Aldo Moro 2, I-00185 Roma, Italy 5 Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India (literal)
Titolo
  • Combined Raman and infrared investigation of the insulator-to-metal transition in NiS(2-x)Se(x) compounds (literal)
Abstract
  • Ambient-condition Raman spectra were collected in the strongly correlated NiS 1 - x Se x pyrite (0 < x <1.2). Two samples (x = 0 and x = 0.55) were studied as a function of pressure up to 10 GPa, and for the x = 0.55 sample the pressure dependence of the infrared reflectivity was also measured (0-10 GPa). This gave a complete picture of the optical response of that system on approaching the metallic state both by application of pres- sure and/or by Se alloying, which corresponds to a volume expansion. A peculiar nonmonotonic (V-shaped) volume dependence was found for the quasiparticle spectral weight of both pure and Se-doped compounds. In the x = 0.55 sample the vibrational frequencies of the chalcogen dimer show an anomalous volume dependence on entering the metallic phase. The abrupt softening observed, particularly significant for the Se-Se pair, indicates the relevant role of the softness of the Se-Se bond as previously suggested by theoretical calculations. (literal)
Prodotto di
Autore CNR

Incoming links:


Autore CNR di
Prodotto
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi
data.CNR.it