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Mechanism of Tc Increase in Na-Doped Bi2Sr2CaCu2O8+y |
| YU Yang;JIN Xin;XU Xiaonong;SHEN Jiancang;YAO Xixian |
| Department of Physics and Solid Microstructure Laboratory, Nanjing University, Nanjing 210008 |
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| Cite this article: |
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YU Yang, JIN Xin, XU Xiaonong et al 1994 Chin. Phys. Lett. 11 46-48 |
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Abstract Samples of Bi2.2Sr1.8Ca1.05Cu2.15-xNaxO8+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.
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| Keywords:
74.72.Hs
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Published: 01 January 1994
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