EFFECT OF NONSTOICHIOMETRY AND CE-DOPING ON THE TETRAGONAL SUPERCONDUCTING PHASE CABALACU3O7-DELTA

被引：2
|
作者：
GOPALAKRISHNAN, IK
GUNASEKARAN, RA
YAKHMI, JV
IYER, RM
机构：
[1] Chemical Group, Bhabha Atomic Research Centre, Trombay, 400 085, Bombay
来源：
BULLETIN OF MATERIALS SCIENCE | 1991年 / 14卷 / 02期
关键词：
CABALACU3O7-DELTA; NONSTOICHIOMETRY; CERIUM-DOPING TETRAGONAL SUPERCONDUCTING PHASE;
D O I：
10.1007/BF02747328
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have synthesized CaBaLaCu3O7-delta and related compounds Ca0.9BaLaCu3O7-delta, Ca11 BaLaCu3O7-delta and Ca0.9Ce0.1 BaLaCu3O7-delta in order to investigate the effect of doping and non-stoichiometry at Ca-sites on the superconducting behaviour of tetragonal superconductor CaBaLaCu3O7-delta. The superconducting transition temperature (T(c)) of Ca0.9 BaLaCu3O7-delta is the same as that of pure CaBaLaCu3O7-delta(67 +/- 1 K). Calcium excess compound Ca1.1 BaLaCu3O7-delta showed an enhancement in T(c) to 72 K while the cerium-substituted compound Ca0.9 Ce0.1 BaLaCu3O7-delta showed a drop in T(c) to 43 K. The results are explained on the basis of difference in valency between the host and the dopant ion.
引用
收藏
页码：275 / 278
页数：4
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