Non-monotonic behaviour of the superconducting order parameter in Nb/PdNi bilayers observed through point contact spectroscopy

Abstract

Point contact spectroscopy measurements have been performed on Nb/PdNi bilayers in which the thickness of the Nb layer, dNb, was kept constant to 40 nm while the thickness of PdNi, dPdNi, was changed from 2 nm to 9 nm. Features related to the superconducting gap induced in the ferromagnet have been observed in the dV/dI versus V curves. These structures show a non-monotonic behaviour as a function of dPdNi as a consequence of the damped oscillatory behaviour of the superconducting order parameter in the ferromagnetic layer.

to appear on Superconductor Science and Technology

References in corpus (2)

• The BCS-like gap in superconductor SmFeAsO_0.85F_0.15
• Point Contact Spectra on YBa${}_2$Cu${}_3$O${}_{7-x}$/La${}_{0.7}$Ca${}_{0.3}$MnO${}_3$ bilayers