Abstract
Improving the superconductivity of thin films, especially the critical current density (JC) and the critical field (HC), is crucial for the application of superconducting devices. Here, we apply a simple hybrid structure to enhance the superconductivity of Nb films induced by a hexagonal-array-cooling-shrinkage (HACS) effect, which is very sensitive to the temperature and magnetic field. The HC of the hybrid at 8.8 K is ∼32% more than that of a flat Nb film, while it is increased to ∼1000% at 8.97 K. In addition, the HACS effect to enhance superconductivity is more effective than that by uniform compression stress with the same value. The newly proposed approach can be used as self-protection to prevent superconducting devices from losing their superconductivity due to excessive current or magnetic fields.
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