Approaching depairing current in dirty thin superconducting strip covered by low resistive normal metal
S. S. Ustavschikov, M. Yu. Levichev, I. Yu. Pashen’kin, А.М. Клушин, D. Yu. Vodolazov
Abstract
Abstract We experimentally demonstrate that a thin dirty superconducting (S) strip covered by low resistive normal metal (N) approaches closer to the depairing current than a single S strip, which makes its non-linear properties stronger. The obtained result comes from proximity-induced superconductivity in the N layer, its large contribution to the superconducting properties of the SN bilayer and larger sensitivity to the current than that of the host S layer. We argue that such an SN bilayer could be a promising system for different applications based on the current-dependent kinetic inductance. In addition, we also find that in the presence of the N layer the maximal vortex velocity in the resistive state considerably increases.