Two-band effect on the superconducting fluctuating diamagnetism in MgB2 (Articolo in rivista)

Type
Label
  • Two-band effect on the superconducting fluctuating diamagnetism in MgB2 (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Alternative label
  • Romanò, L; Lascialfari, A; Rigamonti, A; Zucca, I (2005)
    Two-band effect on the superconducting fluctuating diamagnetism in MgB2
    in Physical review letters (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Romanò, L; Lascialfari, A; Rigamonti, A; Zucca, I (literal)
Pagina inizio
  • 247001 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 94 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Department of Physics and Unita` INFM-CNR, University of Parma, Parco Area delle Scienze 7A, 43100 Parma, Italy; Department of Physics and Unita` INFM-CNR, University of Pavia, Via Bassi 6, I-27100, Pavia, Italy (literal)
Titolo
  • Two-band effect on the superconducting fluctuating diamagnetism in MgB2 (literal)
Abstract
  • The field dependence of the magnetization above the transition temperature Tc in MgB2 is shown to evidence a diamagnetic contribution consistent with superconducting fluctuations reflecting both the sigma and pi bands. In particular, the upturn field Hup in the magnetization curve, related to the incipient effect of the magnetic field in quenching the fluctuating pairs, displays a double structure, in correspondence with two correlation lengths. The experimental findings are satisfactorily described by the extension to the diamagnetism of a recent theory for paraconductivity, in the framework of a zero-dimensional model for the fluctuating superconducting droplets above Tc. (literal)
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