| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Continuously Doping Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$ into Electron-Doped Superconductor by CaH$_{2}$ Annealing Method |
| Jin Zhao1,2†, Yu-Lin Gan1,2†, Guang Yang1,2†, Yi-Gui Zhong1,2,3, Cen-Yao Tang1,2, Fa-Zhi Yang1,2, Giao Ngoc Phan1, Qiang-Tao Sui1,2, Zhong Liu1, Gang Li1, Xiang-Gang Qiu1, Qing-Hua Zhang1, Jie Shen1, Tian Qian1,4, Li Lu1, Lei Yan1, Gen-Da Gu5, and Hong Ding1,2,4* |
1Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2School of Physics, University of Chinese Academy of Sciences, Beijing 100190, China
3Institute for Solid State Physics, University of Tokyo, Chiba 277-8581, Japan
4Songshan Lake Materials Laboratory, Dongguan 523808, China
5Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
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Jin Zhao, Yu-Lin Gan, Guang Yang et al 2022 Chin. Phys. Lett. 39 077403 |
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Abstract 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. Traditional doping methods can regulate its doping level within the range of hole doping. Here we report the first application of CaH$_{2}$ annealing method in regulating the doping level of Bi2212. By continuously controlling the anneal time, a series of differently doped samples can be obtained. The combined experimental results of x-ray diffraction, scanning transmission electron microscopy, resistance and Hall measurements demonstrate that the CaH$_{2}$ induced topochemical reaction can effectively change the oxygen content of Bi2212 within a very wide range, even switching from hole doping to electron doping. We also found evidence of a low-$T_{\rm c}$ superconducting phase in the electron doping side.
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Received: 19 May 2022
Express Letter
Published: 20 June 2022
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