Strongly Enhanced Vortex Pinning by Conformal Crystal Arrays
arXiv:1210.1229 · doi:10.1103/PhysRevLett.110.267001
Abstract
Conformal crystals are non-uniform structures created by a conformal transformation of regular two-dimensional lattices. We show that gradient-driven vortices interacting with a conformal pinning array exhibit substantially stronger pinning effects over a much larger range of field than found for random or periodic pinning arrangements. The pinning enhancement is partially due to matching of the critical flux gradient with the pinning gradient, but the preservation of the sixfold ordering in the conformally transformed hexagonal lattice plays a crucial role. Our results can be generalized to a wide class of gradient-driven interacting particle systems such as colloids on optical trap arrays.
6 pages, 6 postscript figures
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- Characterization of relaxation processes in interacting vortex matter through a time-dependent correlation length
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- Enhancing the effective critical current density in a Nb superconducting thin film by cooling in an inhomogeneous magnetic field
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- Topology by Design in Magnetic nano-Materials: Artificial Spin Ice
- Magnetic mapping of defects in type-II superconductors
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- Vortex Guidance and Transport in Channeled Pinning Arrays
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