Self-assembled vortex crystals induced by inhomogeneous magnetic textures
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Data
2019-01-01
Autores
Menezes, Raí M.
Sardella, Edson [UNESP]
Cabral, Leonardo R.E.
De Souza Silva, Clécio C.
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Resumo
We investigate the self-assembly of vortices in a type-II superconducting disk subjected to highly nonuniform confining potentials produced by inhomogeneous magnetic textures. Using a series of numerical experiments performed within the Ginzburg-Landau theory, we show that vortices can arrange spontaneously in highly nonuniform, defect-free crystals, reminiscent of conformal lattices, even though the strict conditions for the conformal crystal are not fulfilled. These results contradict continuum-limit theory, which predicts that the order of a nonuniform crystal is unavoidably frustrated by the presence of topological defects. By testing different cooling routes of the superconductor, we observed several different self-assembled configurations, each of which corresponding to one in a set of allowed conformal transformations, which depends on the magnetic and thermal histories of the system.
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conformal crystals, frustrated crystals, topological defects, Vortex phases
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Journal of Physics Condensed Matter, v. 31, n. 17, 2019.