Localized quasiparticle states in superconducting contacts with a paramagnetic tunnel barrier
Kuplevakhskii S. V. , Fal'ko I. I.
A localized quasiparticle state is predicted in a superconducting contact with a paramagnetic tunnel barrier in the absence of Josephson currents and magnetic fields. The energy of the state would be in the gap and would be degenerate in the orientation of the quasiparticle spin. The results of this study can be used to interpret tunneling experiments on Pb/Ho(OH)3/Pb and Pb/Er(OH)3/Pb systems.