Evidence for Fluctuation Superconductivity in Bulk Type-II Superconductors

Abstract

Electrical resistivity measurements on bulk specimens of very-short-coherence-distance [${\left(l{\xi }_0\right)}^{\frac{1}{2}}\approx 50$ Å] type-II superconducting alloys suggest the presence of fluctuation superconductivity at temperatures up to at least $2T_c$, where $T_c$ approximates the bulk superconducting transition temperature. Apparent magnetic field quenching of fluctuation superconductivity is observed up to 50 kG both above and below $T_c$.