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物理学报. 1994, 43(5): 829-833.
doi: 10.7498/aps.43.829.
Bi2Sr2CaCu2O8+y掺Na样品的超导机制
- 收稿日期: 1993-07-05
- 刊出日期: 1994-05-20
摘要: 用熔融法制备了Bi2Sr2CaCu2O8+y掺Ｎａ多晶样品，转变温度Ｔc提高到９０Ｋ以上，最大的零电阻温度达到９２．５Ｋ。在流动氧气退火后，未掺Ｎａ样品Ｔc显著降低，而掺Ｎａ样品Ｔc几乎不变，说明二者Ｔc提高具有不同的机制。据此我们认为Ｎａ替代了Ｂｉ而使Ｂｉｏ层电荷失去平衡，Ｃｕｏ面上电子转移到Ｂｉｏ层而形成空穴，空穴和电子的吸引相
English Abstract
MECHANISM OF SUPERCONDUCTIVITY FOR Na-DOPED Bi2Sr2CaCu2O8+y
- Received Date:
05 July 1993
- Published Online:
20 May 1994
Abstract: We have prepared Na-doped Bi2Sr2CaCu2O8+y(x=0，0.4，0.5, 0.6, 0.7，0.8，1) samples by melting process. The transition temperature of the samples increased up to 90K, and maximum Tc0 achieved was 92.5K. During annealing in flowing oxygen at-mosphere, the Tc of the undoped sample degrade but in the Na-doped sample there is no dramatic Tc change, that indicates their Tc increase have different mechanism. So we believe Na substitution of Bi may destroy the charge balance of BiO layers, the electrons in CuO planes transfer to BiO layers thus create holes in Cu0 planes, the attraction between holes and electrons may be responsible for the superconductivity.
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