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26 April 2024 |
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Article overview
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The onset, evolution and magnetic braking of vortex lattice instabilities in nanostructured superconducting films | | O.-A. Adami
; Ž. L. Jelić
; C. Xue
; M. Abdel-Hafiez
; B. Hackens
; V. V. Moshchalkov
; M. V. Milošević
; J. Van de Vondel
; A. V. Silhanek
; | | Date: |
4 Dec 2015 | | Abstract: | 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 sufficiently 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 films, using
an artificial periodic pinning array of triangular holes, we show that a unique
and well defined 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 effects, caused by a thick Cu layer deposited on top of the
superconductor, on the instabilities and the vortex ratchet effect | | Source: | arXiv, 1512.1425 | | Services: | Forum | Review | PDF | Favorites | |
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