Ion size effects on T-c and interplanar coupling in RBa(2)Cu(3)O(7-delta)

被引：72

作者：

Williams, GVM

Tallon, JL

机构：

[1] New Zealand Inst. Indust. R. and D., Lower Hutt

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 1996年 / 258卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(95)00834-9

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The superconducting transition temperature and oxygen content in optimally doped RBa(2)Cu(3)O(7-delta) samples with R = Yb, Er, Dy, Y, Gd, Eu, Nd has been studied as a function of ionic radius. By using samples with optimal hole concentrations the uncertainty in the doping state of previous studies is eliminated and T-c is observed to increase with the size of the rare earth atom. Within the ionic bond-valence-sum model, the increase in T-c can be attributed to an increased hole distribution on the plane oxygen sites relative to the plane Cu sites. From conductivity fluctuations, the c-axis coherence length was also observed to increase with rare earth ionic radius due to decreasing disorder on the chains.

引用

页码：41 / 46

页数：6

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