CRYSTAL-STRUCTURE AND RESISTIVITY STUDIES ON PRBA2-XPRXCU3O7-Y OXIDE SYSTEM

被引:1
|
作者
MALIK, SK
TOMY, CV
PRASAD, R
SONI, NC
ADHIKARI, K
机构
[1] Tata Institute of Fundamental Research, Bombay
[2] Bhabha Atomic Research Centre, Bombay
关键词
PRBA2-XPRXCU3O7-Y; STRUCTURE; RESISTIVITY; MAGNETISM;
D O I
10.1007/BF02747455
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The compound PrBa2Cu3O7-y is not superconducting while most other RBa2Cu3O7-y (R = rare earth) compounds exhibit superconductivity in the 90 K range. The system PrBa2-xPr(x)Cu3O7-y has been prepared to study the effect of excess Pr at the Ba site on the structure, resistivity and magnetic behaviour of this system. It is observed that single-phase compounds in the above series form for x = 0.8-that is up to the composition Pr1.8Ba1.2Cu3O7-y. While stoichiometric PrBa2Cu3O7-y is orthorhombic, the compounds with excess Pr show tetragonal structure. Four-probe dc resistivity measurements show that all the single-phase compounds in the above series do not exhibit superconductivity and are semiconducting down to 12 K. Magnetic susceptibility measurements reveal deviation from Curie-Weiss behaviour starting at a characteristic temperature, which is taken to be the ordering temperature (T(N)) of the Pr moments. Both T(N) and overall resistivity decrease with increasing x and may have a common origin.
引用
收藏
页码:943 / 947
页数:5
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