Mechanism of Tc Increase in Na-Doped Bi2 Sr2 CaCu2 O8+y
YU Yang, JIN Xin, XU Xiaonong, SHEN Jiancang, YAO Xixian
Department of Physics and Solid Microstructure Laboratory, Nanjing University, Nanjing 210008
Mechanism of Tc Increase in Na-Doped Bi2 Sr2 CaCu2 O8+y
YU Yang;JIN Xin;XU Xiaonong;SHEN Jiancang;YAO Xixian
Department of Physics and Solid Microstructure Laboratory, Nanjing University, Nanjing 210008
关键词 ：
74.72.Hs
Abstract ： Samples of Bi2.2 Sr1.8 Ca1.05 Cu2.15-x Nax O8+y (x=0, 0.7) were prepared by melt-processing technique. The maximum transition temperature increased up to 100 K, and Tc0 achieved 92.5K. In order to study the mechanism of Tc increasing, samples were annealed in a flowing oxygen, atmosphere. The reversibility of Tc was observed in undoped sample, while the Tc of Na-doped sample had no significant changes. We believe that the Tc is correlated with a redistribution of holes between the BiO layers and the CuO planes. Doping sodium changes the hole density of CuO planes into an “optimium” value so as to increase Tc .
Key words ：
74.72.Hs
出版日期: 1994-01-01
引用本文:
YU Yang;JIN Xin;XU Xiaonong;SHEN Jiancang;YAO Xixian. Mechanism of Tc Increase in Na-Doped Bi2 Sr2 CaCu2 O8+y [J]. 中国物理快报, 1994, 11(1): 46-48.
c Increase in Na-Doped Bi2 Sr2 CaCu2 O8+y . Chin. Phys. Lett., 1994, 11(1): 46-48.
链接本文:
https://cpl.iphy.ac.cn/CN/
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https://cpl.iphy.ac.cn/CN/Y1994/V11/I1/46
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