[en] In superconducting films under an applied dc current, we analyze
experimentally and theoretically the influence of engineered pinning on the
vortex velocity at which the flux-flow dissipation undergoes an abrupt transition
from low to high resistance. We argue, based on a nonuniform distribution
of vortex velocity in the sample, that in strongly disordered systems the
mean critical vortex velocity for flux-flow instability (i) has a nonmonotonic
dependence on magnetic field and (ii) decreases as the pinning strength is
increased. These findings challenge the generally accepted microscopic model of
Larkin and Ovchinnikov (1979 J. Low. Temp. Phys. 34 409) and all subsequent
refinements of this model which ignore the presence of pinning centers.
Disciplines :
Physics
Author, co-author :
Silhanek, Alejandro ; Université de Liège - ULiège > Département de physique > Physique de la matière condensée
Leo, A.; Universita degli Studi di Salerno > Fisica
Grimaldi, G.; Universita degli Studi di Salerno > Fisica
Berdiyorov, G.R.; Universiteit Antwerpen - UA > Fysica
Milosevic, M.V.; Universiteit Antwerpen - UA > Fysica
Nigro, A.; Universita degli Studi di Salerno > Fisica
Pace, S.; Universita degli Studi di Salerno > Fisica
Verellen, N.; Katholieke Universiteit Leuven - KUL > Physics and Astronomy
Gillijns, W.; Katholieke Universiteit Leuven - KUL > Physics and Astronomy
Metlushko, V.; University of Illinois > Department of Electrical and Computer Engineering
Ilic, B.; Cornell University > School of Applied and Engineering Physics
Zhu, Xiaobin; Seagate Technology Inc
Moshchalkov, V.V.; Katholieke Universiteit Leuven - KUL > Physics and Astronomy
scite shows how a scientific paper has been cited by providing the context of the citation, a classification describing whether it supports, mentions, or contrasts the cited claim, and a label indicating in which section the citation was made.
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