Critical current density field and thickness dependence in thin flakes of quasi-two-dimensional superconductor NbS2

Abstract

We present an investigation of the critical current density and pinning force in superconducting NbS2 flakes in a parallel magnetic field. Our study demonstrates that the critical current in intermediate fields exhibits strong pinning across the full temperature range. Investigation of the pinning force suggests significant contributions from both point-like and surface defects. We observe an increase in critical current density with decreasing the sample thickness, which can be associated with a transition to two-dimensional pinning. The 3D phase diagram Jc(B, T) of the NbS2 flake in a parallel field is plotted.