A1 Refereed original research article in a scientific journal

Angle dependent molecular dynamics simulation of flux pinning in YBCO superconductors with artificial pinning sites




AuthorsPaturi P, Malmivirta M, Hynninen T, Huhtinen H

PublisherIOP PUBLISHING LTD

Publication year2018

JournalJournal of Physics: Condensed Matter

Journal name in sourceJOURNAL OF PHYSICS-CONDENSED MATTER

Journal acronymJ PHYS-CONDENS MAT

Article numberARTN 315902

Volume30

Issue31

Number of pages7

ISSN0953-8984

eISSN1361-648X

DOIhttps://doi.org/10.1088/1361-648X/aad02b

Self-archived copy’s web addresshttps://research.utu.fi/converis/portal/detail/Publication/35451758


Abstract
A molecular dynamics (MD) simulation to simulate the vortices in superconductors with artificial pinning sites is presented. The simulation reproduces the correct anisotropic behavior in angular dependence of critical current. We also show that the shape of the J(c)(B) curve depends on the size of the pinning sites and the change from p = 0.5 to p approximate to 1 is due to the breaking of the vortex lattice to individually acting vortices. The results beautifully correspond to experimental data. Furthermore, we found that the size and shape of the c-axis peak observed with columnar pinning sites in J(c)(theta) also depends on the size of the rods, larger pinning sites leading to wider peaks. The results obtained from the MD-simulation are similar to those of the much more computationally intensive Ginzburg-Landau simulations. Furthermore, the MD-simulations can provide insight to the vortex dynamics within the samples.

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