| Tl-1223超导体的额外氧效应 |
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| 引用本文： | 陈霞,蔡华清.Tl-1223超导体的额外氧效应[J].湛江师范学院学报,2007,28(3). |
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| 作者姓名： | 陈霞 蔡华清 |
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| 作者单位： | 1. 湛江师范学院,物理科学与技术学院,广东,湛江,524048
2. 湛江师范学院,信息科学与技术学院,广东,湛江,524048 |
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| 基金项目： | 湛江师范学院校科研和教改项目 |
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| 摘 要： | 结合有效价键模型和原子对势的理论计算研究了Tl-1223超导相的Cu-O金字塔五配位上由于Fe掺杂所导致的额外氧效应.研究结果表明:Fe掺杂原子占据Cu晶位后,将导致额外氧进入晶格而占据Ca原子四方网络的间隙位置.Fe掺杂所带来的额外氧,对Cu-O面载流子有很大的局域化作用,导致了载流子浓度降低,同时破坏了Cu-O平面的完整性,也致使Tc下降,这一点得到了超导电性测量的证实.
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| 关 键 词： | Tl-1223超导体 额外氧效应 有效价键模型 原子对势 Cu-O金字塔五配位 |
Extra Oxygen Effect of the Tl-System Superconductor |
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| CHEN Xia,CAI Hua-qing.Extra Oxygen Effect of the Tl-System Superconductor[J].Journal of Zhanjiang Normal College,2007,28(3). |
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| Authors: | CHEN Xia CAI Hua-qing |
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| Abstract: | Using effective valence model and atom pair potential theory,we calculate extra oxygen effect on Fe adulterate in Cu-O pyramid five coordinated for Tl-1223 superconductor.The results show that the iron adulterate atom occupied the copper crystal sites to allow extra oxygen to enter crystal lattice and occupy the Ca atom square network interstice sites.The Fe adulterate leads to extra oxygen to have bigger localizing action for Cu-O plane carrier,that the carrier concentration by decreased,at the same time destroy integrity of Cu-O plane,that Tc has gone down.This is proved by superconductivity tests. |
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| Keywords: | Tl-1223 superconductor extra oxygen effect effective valence model atom pair potential Cu-O pyramid five coordinate |
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