Dynamic ordering and instability of the vortex lattice in Nb films exhibiting moderately strong pinning (Articolo in rivista)

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Label
  • Dynamic ordering and instability of the vortex lattice in Nb films exhibiting moderately strong pinning (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.80.144521 (literal)
Alternative label
  • G. Grimaldi;A. Leo; A. Nigro; S. Pace; R.P. Huebener (2009)
    Dynamic ordering and instability of the vortex lattice in Nb films exhibiting moderately strong pinning
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • G. Grimaldi;A. Leo; A. Nigro; S. Pace; R.P. Huebener (literal)
Pagina inizio
  • 144521-1 (literal)
Pagina fine
  • 144521-10 (literal)
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  • http://link.aps.org/doi/10.1103/PhysRevB.80.144521 (literal)
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  • 80 (literal)
Rivista
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  • 10 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • CNR - INFM Laboratorio Regionale SuperMat Dipartimento di Fisica \"E. R. Caianiello\" Università di Salerno (literal)
Titolo
  • Dynamic ordering and instability of the vortex lattice in Nb films exhibiting moderately strong pinning (literal)
Abstract
  • We study the nonlinear effects in the current-voltage characteristics of Nb superconducting thin films, induced both by the current dependence of the pinning force and by the electric-field dependence of the flux-flow resistance of Abrikosov vortices driven by high electric currents. Despite of the quite strong pinning in our samples, by increasing the bias current, in a temperature dependent magnetic-field range, the moving vortex system undergoes a dynamical transition from a disordered to an ordered vortex lattice. Such transition leads to a quite sharp reduction of the dynamic pinning force corresponding to a peak in the current depen-dence of the differential flux-flow resistance. On the same samples, in a higher voltage-velocity regime, for a different temperature dependent magnetic-field range, an instability of the moving vortex lattice also occurs, with a sudden jump in theI-Vcurve from the non linear flux-flow branch to the linear normal resistive state. Within the Larkin-Ovchinnikov velocity dependence of the flux-flow resistance, this flux-flow instability has been studied as function of the magnetic field and temperature in order to get out its nonequilibrium electronic nature. Finally, we propose a dynamic phase diagram to describe the vortex lattice motion driven by high electric currents in the presence of such a disordered pinning landscape. (literal)
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