Critical currents and melting temperature of a two-dimensional vortex lattice with periodic pinning
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
27/05/2014
27/05/2014
01/06/2013
|
Resumo |
The critical current and melting temperature of a vortex system are analyzed. Calculations are made for a two-dimensional film at finite temperature with two kinds of periodic pinning: hexagonal and Kagomé. A transport current parallel and perpendicular to the main axis of the pinning arrays is applied and molecular dynamics simulations are used to calculate the vortex velocities to obtain the critical currents. The structure factor and displacements of vortices at zero transport current are used to obtain the melting temperature for both pinning arrays. The critical currents are higher for the hexagonal pinning lattice and anisotropic for both pinning arrays. This anisotropy is stronger with temperature for the hexagonal array. For the Kagomé pinning lattice, our analysis shows a multi stage phase melting; that is, as we increase the temperature, each different dynamic phase melts before reaching the melting temperature. Both the melting temperature and critical currents are larger for the hexagonal lattice, indicating the role for the interstitial vortices in decreasing the pinning strength. © 2012 Springer Science+Business Media New York. |
Formato |
2147-2151 |
Identificador |
http://dx.doi.org/10.1007/s10948-012-1813-9 Journal of Superconductivity and Novel Magnetism, v. 26, n. 6, p. 2147-2151, 2013. 1557-1939 1557-1947 http://hdl.handle.net/11449/75489 10.1007/s10948-012-1813-9 WOS:000323909500006 2-s2.0-84878286911 |
Idioma(s) |
eng |
Relação |
Journal of Superconductivity and Novel Magnetism |
Direitos |
closedAccess |
Palavras-Chave | #Critical currents #Periodic pinning #Phase melting #Superconductivity #Vortex dynamics #Finite temperatures #Hexagonal lattice #Molecular dynamics simulations #Pinning strength #Structure factors #Transport currents #Anisotropy #Crystal lattices #Melting point #Molecular dynamics #Phase transitions #Two dimensional #Vortex flow |
Tipo |
info:eu-repo/semantics/article |