MgB_2 Superconducting Films Fabricated on Copper Substrate by Hybrid Physical-chemical Vapor Deposition

摘要

The thick MgB_2 films have been successfully grown on the Cu substrate by the technique of hybrid physical-chemical vapor deposition (HPCVD). The films are about 2～3 μm and quite dense. They possess the Tc (onset), as high as 37-38 K, and sharp transition ～0.8 K. X-ray diffraction (XRD) indicates their polycrystalline character. The upper critical field at T=0K, H_(C2)(0), is extrapolated as 15.3T. The controlled growth of MgB_2 film on Cu substrate opens a new route in the preparation of MgB_2 tape materials.