Tunneling results on gap anisotropy in niobium

摘要: Abstract A recently developed theory to describe tunneling into the Meissner phase of clean superconductors is applied a re-discussion experimental data on (Nb single crystal)/Ag junctions taking band structure effects account. Thereby several shortcomings are removed previous analysis which assumed an isotropic gap. The based independent and non-tunneling data. On this basis, quantitative account obtained for our results concerning both broadening characteristics in zero field effect magnetic different crystal orientations. verify was solving Bogoliubov–De Gennes equations tunnel-injected quasiparticles including Doppler shift imposed by shielding current. Moreover, they represent realistic gap anisotropy niobium.