PR-SUBSTITUTION EFFECT ON SUPERCONDUCTIVITY IN R(1-X)PR(X)BA(2)CU(3)O(7-Z) (R=Y,ND,GD)

被引：4
|
作者：
OKADA, A
ARAI, J
UMEZAWA, K
机构：
[1] Department of physics, Faculty of Science and Technology, Science University of Tokyo, Noda, Chiba
来源：
PHYSICA C | 1994年 / 235卷
关键词：
D O I：
10.1016/0921-4534(94)91633-0
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Pr-substitution effect on superconductivity is investigated for the samples of Gd1-xRxBa2Cu3O7-z (R=Pr Nd) through the measurements of lattice parameter, susceptibility, electric resistivity and ESR. With increasing R, lattice parameter c increases for R=Nd but decreases for R=Pr although these ion radius follows GB(3+)<Nd3+<Pr3+, suggesting presence of Pi(4+) ions. The lattice prameter ratio c/a varies considerably for R=Pr but not for R=Nd, implying anisotropic change of lattice parameter in the Pr-substituted samples. These results indicate the presence of both Pr3+ and Pr4+ ions, and also hybridization between Pr(3+)4f and O2p sigma orbitals which leads to covalent bonding along c axis.
引用
收藏
页码：817 / 818
页数：2
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