Temperature dependence of the magnetic field at a vortex center in type-II superconducting vanadium by NMR

Abstract

The field at a vortex center, hv, was measured in a vanadium foil sample and extrapolated to zero temperature and zero flux density. For an isolated vortex at T=0, h=1780±240 G. At all flux densities it appears that is nonzero, even as T→0. © 1970 The American Physical Society.