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R1-xPrxBa2Cu3O7-δ超导Tc平台的离子尺寸效应
引用本文:曹效文,唐元冀,何健民.R1-xPrxBa2Cu3O7-δ超导Tc平台的离子尺寸效应[J].物理学报,1994,43(11):1854-1859.
作者姓名:曹效文  唐元冀  何健民
作者单位:中国科学院等离子体物理研究所
摘    要:系统地研究了R1-xPrxBa2Cu37-δ的超导Tc与Pr替代浓度x的关系。发现在离子半径ri≤ri(Dy)时,在低Pr浓度范围内存在一个超导Tc平台,并且平台宽度表明一个R3+离子尺寸效应。我们认为,Tc平台宽度的离子尺寸效应可能起源于Pr4f电子局域态的改变。提出一个临界R3+离子半径ric,ri>ric时RBa2Cu37-δ的超导电性消失 关键词

关 键 词:RBCO化合物  超导体  离子尺寸效应  临界温度
收稿时间:1993-11-17

ION SIZE EFFECT OF Tc-PLATEAU IN R1-xPrxBa2Cu3O7-δ
CAO XIAO-WEN,Y. J. TANG and J. C. HO.ION SIZE EFFECT OF Tc-PLATEAU IN R1-xPrxBa2Cu3O7-δ[J].Acta Physica Sinica,1994,43(11):1854-1859.
Authors:CAO XIAO-WEN  Y J TANG and J C HO
Abstract:Dependence of superconducting Tc upon Pr-substitution concentration x was studied systematically in R1-xPrxBa2Cu37-δ system with R=Nd, Dy, Tm, Yb and Lu. It was found that there is a Tc-plateau in the range of low x as R3+ radius ri≤ri(Dy). The Pr-concentration width corresponded by Tc-plateau exhibits a R3+ ion size effect. We suggest that the ion size effect of Tc-plateau might result from the change of local state of Pr 4f electron. A critical R3+ radius, ric, is suggested and superconductivity disappears as ri>ric.
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