Surface Nucleation FieldHc3of Pure Lead

Abstract

New measurements of $H_{c3\mathrm{}}\mathrm{}\left(T\right)\mathrm{}$ are presented for pure Pb. The analysis of the present data suggests that $H_{c3\mathrm{}}\mathrm{}\left(T\right)\mathrm{}$ in pure Pb depends strongly upon the type of electron scattering at the surface. When this effect is properly taken into consideration, it is possible to derive the bulk critical field $H_{c2\mathrm{}}\mathrm{}\left(T\right)\mathrm{}$ and Ginzburg-Landau parameter ${\kappa }_1\mathrm{}\left(T\right)\mathrm{}$ of pure Pb, with results very close to predictions from recent theories of strong-coupling superconductors.