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

Autor(es)

Vizarim, Nicolas P. ; Carlone, Maicon ; Verga, Lucas G. ; Venegas, Pablo A.

• Tipo de documento: Artigo Científico
• Fonte: European Physical Journal B; v. 90, n. 9 SEP 2017.
• Citações Web of Science: 5

Resumo

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)

• Processo FAPESP: 12/22141-2 - Estudo dos efeitos de tamanho nas correntes críticas e comportamento dinâmico dos vórtices em fitas supercondutoras do tipo II com desordem periódica à temperatura finita
• Beneficiário: Lucas Garcia Verga
• Modalidade de apoio: Bolsas no Brasil - Mestrado