Highly Effective Superconducting Vortex Pinning in Conformal Crystals
arXiv:1305.5875 · doi:10.1063/1.4811413
Abstract
We have investigated the vortex dynamics in superconducting thin film devices with non-uniform patterns of artificial pinning centers (APCs). The magneto-transport properties of a conformal crystal and a randomly diluted APC pattern are compared with that of a triangular reference lattice. We have found that in both cases the magneto-resistance below the first matching field of the triangular reference lattice is significantly reduced. For the conformal crystal, the magneto-resistance is below the noise floor indicating highly effective vortex pinning over a wide magnetic field range. Further, we have discovered that for asymmetric patterns the R vs. H curves are mostly symmetric.This implies that the enhanced vortex pinning is due to the commensurability with a stripe in the non-uniform APC pattern and not due to a rearrangement and compression of the whole vortex lattice.
submitted to APL on 29/04/13
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- Effect of random pinning on nonlinear dynamics and dissipation of a vortex driven by a strong microwave current
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- Enhancing the effective critical current density in a Nb superconducting thin film by cooling in an inhomogeneous magnetic field
- Vortex Transport and Pinning Effectiveness in Conformal Pinning Arrays
- Different approaches to generate matching effects using arrays in contact with superconducting films
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- Magnetic mapping of defects in type-II superconductors
- Vortex Ordering and Dynamics on Santa Fe Artificial Ice Pinning Arrays
- Vortex Shear Banding Transitions in Superconductors with Inhomogeneous Pinning Arrays