Critical currents in the anisotropic superconductor 2H−NbSe2: Evidence for an upper bound of the surface critical-current density
G. Lazard, P. Mathieu, B. Plaçais, J. Mosqueira, Y. Simon, C. Guilpin, G. Vacquier
DOI 10.1103/PhysRevB.65.064518 · Physical Review B
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Abstract
According to the Mathieu-Simon continuum theory of the vortex state, a large nondissipative supercurrent can flow over a small depth from a rough surface, up to an easily estimated critical value Kc(A/m) of the surface current density. It is shown that Kc must saturate at high fields in an anisotropic crystal when the surface roughness is increased, and the corresponding upper bound only depends on fundamental parameters of the material. Measurements in 2H−NbSe2 crystals confirm this saturation effect quantitatively, as well as the proposed idea that, in a large class of soft samples, the critical current should be entirely accounted for by surface Kc currents.
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