A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Angle dependent molecular dynamics simulation of flux pinning in YBCO superconductors with artificial pinning sites
Tekijät: Paturi P, Malmivirta M, Hynninen T, Huhtinen H
Kustantaja: IOP PUBLISHING LTD
Julkaisuvuosi: 2018
Journal: Journal of Physics: Condensed Matter
Tietokannassa oleva lehden nimi: JOURNAL OF PHYSICS-CONDENSED MATTER
Lehden akronyymi: J PHYS-CONDENS MAT
Artikkelin numero: ARTN 315902
Vuosikerta: 30
Numero: 31
Sivujen määrä: 7
ISSN: 0953-8984
eISSN: 1361-648X
DOI: https://doi.org/10.1088/1361-648X/aad02b
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/35451758
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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