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We investigated effects of Mg impurity doping on Bi2Sr2CaCu2Oy high-temperature superconductor (Bi-2212 HTS). We used Bi-2212 HTS whisker as a sample and tried to improve its anisotropy of critical current density $(J_\mathrm{c})$. For the Mg-doping, we adopted thermal diffusion process. In the process, non-superconducting phase is expected to appear on the surface of the whisker. From experimental...
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