Magnetic-field modulation of the Josephson effect between polycrystalline CeCu₂Si₂and Al

Full-Gap Superconductivity Robust against Disorder in Heavy-Fermion CeCu2Si2

“…However, given the quantitative nature of this argument further experimental confirmation is needed. Previous attempts at phase-sensitive measurements focused on the Josephson effect between CeCu 2 Si 2 and Al [11,12]. Although a finite Josephson current and conventional Fraunhofer pattern were observed, the results are not conclusive because the polycrystalline nature of the samples used complicates the interpretation.…”

“…Although a finite Josephson current and conventional Fraunhofer pattern were observed, the results are not conclusive because the polycrystalline nature of the samples used complicates the interpretation. Moreover, in such measurements the possibility of a surface-induced s-wave component cannot be ruled out [12]. Thus bulk We also plot Tc/Tc0 as a function of residual resistivity ρ0 taken from the reported resistivity data ρ(T ) [1] (lower axis).…”