期刊
ACS APPLIED ELECTRONIC MATERIALS
卷 2, 期 5, 页码 1381-1387出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaelm.0c00155
关键词
polystyrene spheres; hexagonal array; superconductivity; critical current density; critical field
资金
- Natural Science Foundation of China [51671139, 51802211]
- program of China Scholarships Council [201808330227]
Improving the superconductivity of thin films, especially the critical current density (J(C)) and the critical field (H-C), 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 H-C of the hybrid at 8.8 K is similar to 32% more than that of a flat Nb film, while it is increased to similar 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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