Recently, the Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences made another important breakthrough in superconductivity research. State Key Laboratory of Information Functional Materials, Superconducting Laboratory Jiang Da, Hu Tao and others realized graphene/ultra-thin superconducting bi2sr2cacu2o8+x(bi2212) heterojunction through mechanical exfoliation, in single-layer cell or even half-layer cell A superconducting transition higher than the temperature of liquid nitrogen is found in the thick bi2212 material.

　　This result suggests that the normal-state resistive transport characteristics of bi222 material may have nothing to do with the superconducting mechanism. This discovery has important reference significance for further research on the copper-based superconducting mechanism. The research results also show that the graphene/ultra-thin bi2212 heterojunction exhibits obvious nonlinear i-v characteristics, which provides the possibility for the development of new principles of superconducting devices.