Abstract
The critical current and vortex glass (VG) transition of K0.62Fe1.71Se2 crystal have been studied via measuring the current-voltage characteristics by rotating the crystal around its c-axis in magnetic fields parallel to the ab-plane. It is found that the curves show a good three-dimensional VG scaling collapse. The and VG transition temperature exhibit a distinct fourfold symmetry due to the in-plane fourfold superconducting stripe structure in the nanoscale phase-separated system. The is clearly enhanced for fields parallel to the superconducting stripe owning to the increased pinning associated with the nanoscale phase separation.
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