http://www.cnr.it/ontology/cnr/individuo/prodotto/ID181434
Dynamic ordering and instability of the vortex lattice in Nb films exhibiting moderately strong pinning (Articolo in rivista)
- Type
- 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
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- G. Grimaldi;A. Leo; A. Nigro; S. Pace; R.P. Huebener (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
- http://link.aps.org/doi/10.1103/PhysRevB.80.144521 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- 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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- Autore CNR
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