Weakly and Tightly Bound Polarons in the Infrared Spectra of Perovskites. (Articolo in rivista)

Type
Label
  • Weakly and Tightly Bound Polarons in the Infrared Spectra of Perovskites. (Articolo in rivista) (literal)
Anno
  • 1996-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0031-8949/1996/T66/039 (literal)
Alternative label
  • M. Capizzi, P. Calvani, P. Dore, S. Lupi, P. Maselli, A. Paolone and B. Ruzicka 1 W. Sadowski 2 and S.-W. Cheong 3 (1996)
    Weakly and Tightly Bound Polarons in the Infrared Spectra of Perovskites.
    in Physica scripta. T
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • M. Capizzi, P. Calvani, P. Dore, S. Lupi, P. Maselli, A. Paolone and B. Ruzicka 1 W. Sadowski 2 and S.-W. Cheong 3 (literal)
Pagina inizio
  • 215 (literal)
Pagina fine
  • 219 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • T66 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1 INFM - DipartIMento di Fisica, UniversitA di Roma \"La Sapienza\", Piazzale A. Mor0 2,140185 Roma, Italy 2 Department of Applied Physics & Mathematics, Technical University of Gdansk, G. Narutowicza 11/12,80-952G dansk, Poland 3 AT&T Bell Laboratories, 600 Mountain Ave., Murray Hill, New Jersey 07974, U.S.A. (literal)
Titolo
  • Weakly and Tightly Bound Polarons in the Infrared Spectra of Perovskites. (literal)
Abstract
  • Infrared reflectivity and/or absorption measurements in chemically doped perovskites, including high-T-c superconductors, show polaronic features similar to those observed in the photoinduced spectra of cuprates. These features, whose intensities depend on doping and temperature, are observed in both n-type and p-type materials. They include extra-phonon infrared-active vibrations (IRAV) and a broad band centered al similar to 1000 cm(-1), which results from overtones of IRAVs and is well described in terms of photoexcitation of polarons. Most of the above features survive as extra-Drude peaks in the metallic phase of these materials. The strength of the polaron band increases for decreasing temperature, as expected for weakly bound polarons, in compounds which are parents of high-T-c superconductors. It decreases, instead, as expected for tightly bound polarons, in a Mn-based perovskite and in CuO, which do not become superconducting upon doping. A comparison with tunneling results shows that the superconducting carriers are strongly coupled to the IRAVs. (literal)
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