Pairing state in the ruthenocuprate superconductor RuSr2GdCu2O8: A point-contact Andreev reflection spectroscopy study (Articolo in rivista)

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  • Pairing state in the ruthenocuprate superconductor RuSr2GdCu2O8: A point-contact Andreev reflection spectroscopy study (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.73.064514 (literal)
Alternative label
  • Piano, S; Bobba, F; Giubileo, F; Cucolo, AM; Gombos, M; Vecchione, A (2006)
    Pairing state in the ruthenocuprate superconductor RuSr2GdCu2O8: A point-contact Andreev reflection spectroscopy study
    in Physical review. B, Condensed matter and materials physics; American Physical Society (APS), College Pk (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Piano, S; Bobba, F; Giubileo, F; Cucolo, AM; Gombos, M; Vecchione, A (literal)
Pagina inizio
  • 064514-1 (literal)
Pagina fine
  • 064514-8 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://prb.aps.org/abstract/PRB/v73/i6/e064514 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 73 (literal)
Rivista
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  • 8 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Salerno, Dept Phys, I-84081 Baronissi, SA, Italy; Univ Salerno, INFM, CNR, SUPERMAT Lab, I-84081 Baronissi, SA, Italy (literal)
Titolo
  • Pairing state in the ruthenocuprate superconductor RuSr2GdCu2O8: A point-contact Andreev reflection spectroscopy study (literal)
Abstract
  • The results of point contact Andreev reflection spectroscopy on polycrystalline RuSr2GdCu2O8 pellets are presented. The wide variety of the measured spectra are all explained in terms of a modified Blonder-Tinkham-Klapwijk model considering a d-wave symmetry of the superconducting order parameter. Remarkably low values of the energy gap Delta=(2.8 +/- 0.2) meV and of the 2 Delta/k(B)T(c)similar or equal to 2 ratio are inferred. From the temperature evolution of the dI/dV vs V characteristics we extract a sublinear temperature dependence of the superconducting energy gap. The magnetic field dependence of the conductance spectra at low temperatures is also reported. From the Delta vs H evolution, a critical magnetic field H-c2 similar or equal to 30 T is inferred. To properly explain the curves showing gap-like features at higher voltages, we consider the formation of a Josephson junction in series with the point contact junction, as a consequence of the granularity of the sample. (literal)
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