Evidence for low-field crossover in the vortex critical velocity of type-II superconducting thin films (Articolo in rivista)

Type
Label
  • Evidence for low-field crossover in the vortex critical velocity of type-II superconducting thin films (Articolo in rivista) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.82.024512 (literal)
Alternative label
  • Grimaldi, G; Leo, A; Zola, D; Nigro, A; Pace, S; Laviano, F; Mezzetti, E (2010)
    Evidence for low-field crossover in the vortex critical velocity of type-II superconducting thin films
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Grimaldi, G; Leo, A; Zola, D; Nigro, A; Pace, S; Laviano, F; Mezzetti, E (literal)
Pagina inizio
  • 024512-1 (literal)
Pagina fine
  • 024512-6 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://link.aps.org/doi/10.1103/PhysRevB.82.024512 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 82 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 6 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR - SPIN Salerno Dipartimento di Fisica \"E.R. Caianiello\", Università di Salerno (literal)
Titolo
  • Evidence for low-field crossover in the vortex critical velocity of type-II superconducting thin films (literal)
Abstract
  • We measure current-voltage characteristics as function of magnetic field and temperature in Nb strips of different thickness and width. The instability voltage of the flux-flow state related to the vortex critical velocity v* is studied and compared with the Larkin-Ovchinnikov theory. Beside the usual power-law dependence v*=B-1/2, in the low-field range a new crossover field, Bcr1, is observed below which v* decreases by further lowering the external magnetic field B. We ascribe this unexpected crossover to vortex channeling due to a fanlike penetration of the applied magnetic field as confirmed by magneto-optic imaging. The observation of Bcr1 becomes a direct evidence of a general feature in type-II superconducting films at low fields that is a channel-like vortex motion induced by the inhomogeneous magnetic state caused by the relatively strong pinning. (literal)
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