Optical study of insulator-to-metal transition in LaxMnO3 thin films (Articolo in rivista)

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  • Optical study of insulator-to-metal transition in LaxMnO3 thin films (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/2053-1591/1/3/036406 (literal)
Alternative label
  • W.S.Mohamed, P.Maselli, P.Calvani, L.Baldassarre, P.Orgiani, A.Galdi, L.Maritato, A.Nucara (2014)
    Optical study of insulator-to-metal transition in LaxMnO3 thin films
    in Materials Research Express; IOP PUBLISHING, BRISTOL (Regno Unito)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • W.S.Mohamed, P.Maselli, P.Calvani, L.Baldassarre, P.Orgiani, A.Galdi, L.Maritato, A.Nucara (literal)
Pagina inizio
  • 036406-1 (literal)
Pagina fine
  • 036406-12 (literal)
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  • http://iopscience.iop.org/2053-1591/1/3/036406/ (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 1 (literal)
Rivista
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  • 12 (literal)
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  • 1 Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale A. Moro 2, I-00185 Rome, Italy 2 CNR-SPIN and Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale A. Moro 2, I-00185 Rome, Italy 3 Center for Life NanoScience@Sapienza, Istituto Italiano di Tecnologia, Viale Regina Elena 291, 00185 Rome, Italy 4 CNR-SPIN and Dipartimento Ingegneria dell'Informazione, Università di Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano, Salerno, Italy (literal)
Titolo
  • Optical study of insulator-to-metal transition in LaxMnO3 thin films (literal)
Abstract
  • Lanthanum manganites with a massive concentration of La defects can be stabilized in the form of thin films, by exploiting the structural stress produced by a substrate such as SrTiO3. They undergo an insulator-to-metal transition (IMT) like those doped by divalent ions, which is here studied by measuring the optical conductivity of LaxMnO films with x = 0.66, 0.88, 0.98 and 1.10, and with , from the far infrared to the near ultraviolet, and between 20 and 300 K. The IMT is here a slow process which continues down to 100 K at least, more than 250 K below its onset at the Curie temperature Tc and at the TIMT measured from the dc resistivity. The metallization is here monitored through the increase of the Drude term and a transfer of spectral weight from a 'hard' midinfrared band MIR-2 peaked between 3000 and 5000 cm-1 at room temperature, to a 'soft' midinfrared band MIR-1 at ~ 1000 cm-1 and to the Drude term. This evidence is in good agreement with a model of phase separation below Tc, where insulating and paramagnetic regions of small polarons coexist with conducting and ferromagnetic regions populated by large polarons and free carriers (literal)
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