Effect of surface defects on the first field for vortex entry in type-II superconductors
D. Yu. Vodolazov
DOI 10.1103/PhysRevB.62.8691 · Physical Review B
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Abstract
The effect of arbitrary-size surface defects on conditions for vortex entry in bulk type-II superconductors is studied by numerically solving the time-dependent Ginzburg-Landau equations. It is found out that the field Hen for a vortex entry in a sample decreases with a larger size of defects, yet, beginning from a certain size, it practically stops varying and sets at a minimum possible value Henmin (which is larger than the first critical field Hc1). An interpolation expression is found to describe field Henmin as a function of Ginzburg-Landau parameter κ, which fits the numerical results with a high degree of accuracy.
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