Superconducting to insulating transition in Nd1.2Ba1.8Cu3O7+x thin films studied by polarized X-ray absorption spectroscopy (Articolo in rivista)

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  • Superconducting to insulating transition in Nd1.2Ba1.8Cu3O7+x thin films studied by polarized X-ray absorption spectroscopy (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.physc.2007.03.264 (literal)
Alternative label
  • Salluzzo M.; Ghiringhelli G.; Brookes N.B.; De Luca G.M.; Fracassi F.; Vaglio R. (2007)
    Superconducting to insulating transition in Nd1.2Ba1.8Cu3O7+x thin films studied by polarized X-ray absorption spectroscopy
    in Physica. C, Superconductivity (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Salluzzo M.; Ghiringhelli G.; Brookes N.B.; De Luca G.M.; Fracassi F.; Vaglio R. (literal)
Pagina inizio
  • 971 (literal)
Pagina fine
  • 972 (literal)
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  • Conference: 8th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors Location: Dresden, GERMANY Date: JUL 09-14, 2006. Selected and revised paper. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 460 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Naples Federico 2, CNR, INFM,COHERENTIA, Dipartimento Sci Fisiche, Naples, Italy; Politecn Milan, CNR, INFM,COHERENTIA, Dipartimento Fis, I-20133 Milan, Italy; European Synchrotron Res Facil, F-38043 Grenoble, France; Univ Salerno, CNR, INFM,COHERENTIA, Dipartimento Sci Fisiche, I-84081 Salerno, Italy (literal)
Titolo
  • Superconducting to insulating transition in Nd1.2Ba1.8Cu3O7+x thin films studied by polarized X-ray absorption spectroscopy (literal)
Abstract
  • We report a study of the superconducting-insulator (S-I) transition in epitaxial untwinned Nd1.2Ba1.8Cu3O7+x films using Cu-L and O-K edge polarized X-ray absorption spectroscopy (XAS). The S-I transition in realized by reducing the films thickness from 9 to 6 u.c. Due to strain, thin NdBCO films are characterized by structurally identical CuO2 planes. The major differences in the XAS spectra are not associated to states within the CuO2 units in the ab-plane, but to the unoccupied 3d(3z(2)-r(2)) states of copper at the Cu(1) and Cu(2) sites hybridized with the apical 2p(z) O(4) state, and to the unoccupied 2p(z) O(4) states themselves. The experimental results show that the S-I transition induced by change of thickness in Nd1.2Ba1.8Cu3O7+x films is correlated to holes localization at the copper sites of the Cu(1)O charge reservoir layer. The results open new perspectives for the interpretation of the superconducting to insulating transition in the HTS compounds. (c) 2007 Elsevier B.V. All rights reserved. (literal)
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