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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Commensurability effects in the critical forces of a superconducting film with Kagome pinning array at submatching fields

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Vizarim, Nicolas P. ; Carlone, Maicon ; Verga, Lucas G. ; Venegas, Pablo A.
Total Authors: 4
Document type: Journal article
Source: European Physical Journal B; v. 90, n. 9 SEP 2017.
Web of Science Citations: 5

Using molecular dynamics simulations, we find the commensurability force peaks in a two-dimensional superconducting thin-film with a Kagome pinning array. A transport force is applied in two mutually perpendicular directions, and the magnetic field is increased up to the first matching field. Usually the condition to have pronounced force peaks in systems with periodic pinning is associated to the rate between the applied magnetic field and the first matching field, it must be an integer or a rational fraction. Here, we show that another condition must be satisfied, the vortex ground state must be ordered. Our calculations show that the pinning size and strength may dramatically change the vortex ground state. Small pinning radius and high values of pinning strength may lead to disordered vortex configurations, which fade the critical force peaks. The critical forces show anisotropic behavior, but the same dependence on pinning strength and radius is observed for both driven force directions. Different to cases where the applied magnetic field is higher than the first matching field, here the depinning process begins with vortices weakly trapped on top of a pinning site and not with interstitial vortices. Our results are in good agreement with recent experimental results. (AU)

FAPESP's process: 12/22141-2 - Study of size effects in critical currents and dynamical behavior of vortices in type ii superconducting strips with periodic pinning at finite temperature.
Grantee:Lucas Garcia Verga
Support Opportunities: Scholarships in Brazil - Master