Rotational transition, domain formation, dislocations and defects in vortex systems with combined six- and 12-fold anisotropic interactions
ORAL
Abstract
We introduce a new model for a pairwise repulsive interaction potential of vortices in a type-II superconductor, consisting of superimposed six- and 12-fold anisotropies. Using numerical simulations we study how the vortex lattice configuration varies as the magnitudes of the two anisotropic interaction terms change. A triangular lattice appears for all values, and rotates through 30° as the ratio of the six- and 12-fold anisotropy amplitudes is varied. The transition causes the VL to split into domains that have rotated clockwise or counter-clockwise, with grain boundaries that are "decorated" by dislocations consisting of five- and seven-fold coordinated vortices. We also find intra-domain dislocations and defects, and characterize them in terms of their energy cost.
*This work was supported in part by the Notre Dame Center for Research Computing. Work at the University of Notre Dame was supported by the US DOE, Office of Basic Energy Sciences, under Award No. DE-SC0005051. Part of this work was carried out under support by the US DOE through the Los Alamos National Laboratory. Los Alamos National Laboratory is operated by Triad National Security, LLC, for the National Nuclear Security Administration of the US DOE (Contract No. 892333218NCA000001).
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Presenters
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Morten Eskildsen
- Department of Physics, University of Notre Dame
- University of Notre Dame