Enhancement of penetration field in vortex nanocrystals due to Andreev bound states
arXiv:1906.08706 · doi:10.1103/PhysRevB.100.064508
Abstract
We study the penetration field for vortex nanocrystals nucleated in micron-sized samples with edges aligned along the nodal and anti-nodal directions of the d-wave superconducting parameter of BiSrCaCuO. Here we present evidence that the for nanocrystals nucleated in samples with edges parallel to the nodal direction is larger than for the antinodal case, \,\% at low temperatures. This finding supports the theoretical proposal that surface Andreev bound states appearing in a sample with edges parallel to the nodal direction would produce an anomalous Meissner current that increases the Bean-Livingston barrier for vortex penetration.This has been detected thanks to the nucleation of vortex nanocrystals with a significant surface-to-volume ratio.
arXiv comment4 pages, 4 figures
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