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As a typical hole-doped cuprate superconductor, Bi 2 Sr 2 CaCu 2 O 8+{\delta}(Bi2212) carrier doping is mostly determined by its oxygen content. Traditionaldoping methods can regulate its doping level within the range of hole doping.Here we report the first application of CaH 2 annealing method in regulatingthe doping level of Bi2212. By continuously controlling the anneal time, aseries of differently doped samples can be obtained. The combined experimentalresults of x-ray diffraction, scanning transmission electron microscopy,resistance and Hall measurements demonstrate that the CaH 2 inducedtopochemical reaction can effectively change the oxygen content of Bi2212within a very wide range, even switching from hole doping to electron doping.We also found evidence of a low-T c superconducting phase in the electrondoping side.

Continuously Doping Bi 2 Sr 2 CaCu 2 O 8+{\delta} into Electron-Doped Superconductor by CaH 2 Annealing Method