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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2019
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/1910.06885 |
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| _version_ | 1866910415273852928 |
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| author | Olszewski, M. W. Eskildsen, M. R. Reichhardt, C. Reichhardt, C. J. O. |
| author_facet | Olszewski, M. W. Eskildsen, M. R. Reichhardt, C. Reichhardt, C. J. O. |
| contents | 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 degrees 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 domain 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. We discuss how this model could be generalized to other particle-based systems with anisotropic interactions, such as colloids, and consider the limit of very large anisotropy where it is possible to create cluster crystal states. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1910_06885 |
| institution | arXiv |
| publishDate | 2019 |
| record_format | arxiv |
| spellingShingle | Rotational transition, domain formation, dislocations and defects in vortex systems with combined six- and 12-fold anisotropic interactions Olszewski, M. W. Eskildsen, M. R. Reichhardt, C. Reichhardt, C. J. O. Superconductivity Strongly Correlated Electrons 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 degrees 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 domain 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. We discuss how this model could be generalized to other particle-based systems with anisotropic interactions, such as colloids, and consider the limit of very large anisotropy where it is possible to create cluster crystal states. |
| title | Rotational transition, domain formation, dislocations and defects in vortex systems with combined six- and 12-fold anisotropic interactions |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/1910.06885 |