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.

我们通过实验证明，由低电阻正常金属（N）覆盖的较薄的肮脏超导（S）条带比单个S条带更接近去耦电流，这使其非线性特性更强。获得的结果来自于N层中的邻近感应超导性，它对SN双层的超导特性的贡献很大，并且对电流的敏感性比主体S层的更大。我们认为，基于电流相关的动电感，这样的SN双层对于不同的应用可能是一个有前途的系统。此外，我们还发现，在存在N层的情况下，电阻状态下的最大涡旋速度显着增加。