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ION SIZE EFFECT OF Tc-PLATEAU IN R1-xPrxBa2Cu3O7-δ

CAO XIAO-WEN Y. J. TANG J. C. HO

ION SIZE EFFECT OF Tc-PLATEAU IN R1-xPrxBa2Cu3O7-δ

CAO XIAO-WEN, Y. J. TANG, J. C. HO
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  • Received Date:  17 November 1993
  • Published Online:  20 November 1994

ION SIZE EFFECT OF Tc-PLATEAU IN R1-xPrxBa2Cu3O7-δ

  • 1. 中国科学院等离子体物理研究所

Abstract: Dependence of superconducting Tc upon Pr-substitution concentration x was studied systematically in R1-xPrxBa2Cu3O7-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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