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.
No takes yet. Share an insight, caveat, or question.
D. Yu. Vodolazov (2000) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: