Article (Scientific journals)
The onset, evolution and magnetic braking of vortex lattice instabilities in nanostructured superconducting films
Adami, Obaïd-Allah; Jelic, Zeljko; Xue, Cun et al.
2015In Physical Review. B, Condensed Matter, 92, p. 134506
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Keywords :
vortex pinning; vortex dynamics
Abstract :
[en] In 1976 Larkin and Ovchinnikov [Sov. Phys. JETP 41, 960 (1976)] predicted that vortex matter in superconductors driven by an electrical current can undergo an abrupt dynamic transition from a flux-flow regime to a more dissipative state at suficiently high vortex velocities. Typically this transition manifests itself as a large voltage jump at a particular current density, so-called instability current density J, which is smaller than the depairing current. By tuning the effective pinning strength in Al fi lms, using an artifi cial periodic pinning array of triangular holes, we show that a unique and well defi ned instability current density exists if the pinning is strong, whereas a series of multiple voltage transitions appear in the relatively weaker pinning regime. This behavior is consistent with time-dependent Ginzburg-Landau simulations, where the multiple-step transition can be unambiguously attributed to the progressive development of vortex chains and subsequently phase-slip lines. In addition, we explore experimentally the magnetic braking e ffects, caused by a thick Cu layer deposited on top of the superconductor, on the instabilities and the vortex ratchet effect.
Disciplines :
Physics
Author, co-author :
Adami, Obaïd-Allah ;  Université de Liège > Département de physique > Physique expérimentale des matériaux nanostructurés
Jelic, Zeljko ;  Université de Liège > Département de physique > Physique expérimentale des matériaux nanostructurés
Xue, Cun;  Katholieke Universiteit Leuven - KUL
Abdel-Hafiez, Mahmoud;  Université de Liège - ULiège
Hackens, Benoit;  Université Catholique de Louvain - UCL
Moshchalkov, Victor V.;  Katholieke Universiteit Leuven - KUL
Milosevic, Milorad V.;  Universiteit Antwerpen - UA
Van de Vondel, Joris;  Katholieke Universiteit Leuven - KUL
Silhanek, Alejandro  ;  Université de Liège > Département de physique > Physique expérimentale des matériaux nanostructurés
Language :
English
Title :
The onset, evolution and magnetic braking of vortex lattice instabilities in nanostructured superconducting films
Publication date :
08 October 2015
Journal title :
Physical Review. B, Condensed Matter
ISSN :
0163-1829
eISSN :
1095-3795
Publisher :
American Institute of Physics, New York, United States - New York
Volume :
92
Pages :
134506
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 23 September 2015

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