Peak effect in the critical current of Type II superconductors with strong magnetic vortex pinning
Xu, X.B., Fangohr, H., Xu, X.N., Gu, M., Wang, Z.H., Ji, S.M., Ding, S.Y., Shi, D.Q. and Dou, S.X. (2008) Peak effect in the critical current of Type II superconductors with strong magnetic vortex pinning. Physical Review Letters, 101, (14), 147002-[4pp.]. (doi:10.1103/PhysRevLett.101.147002).
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We perform 2D Langevin simulations studying the peak effect (PE) of the critical current taking into account the temperature dependence of the competing forces. We observe and report that the PE results from the competition of vortex-vortex interactions and vortex-pin interactions which have different temperature dependencies. The simulations reveal that the PE can take place only for certain pinning strengths, densities of pinning centers, and driving forces, which is in good agreement with experiments. No apparent vortex order-disorder transition is observed across the PE regime. In addition, the PE is a dynamical phenomenon, and thermal fluctuations can speed up the process for the formation of the PE.
|Subjects:||Q Science > QC Physics|
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences > Computational Engineering and Design
|Date Deposited:||01 Dec 2008|
|Last Modified:||27 Mar 2014 18:45|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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