Fluctuation-induced conductivity and phase separation in composite samples (YBa2Cu3O7-δ)1-y-(PrBa2Cu3O7-δ)y

被引：0
|
作者：
Haas Leandro Monteiro, Joao Frederico [1 ]
Opata, Yuri Aparecido [1 ]
de Leite Gusmao Pinheiro, Lincoln Brum [1 ]
da Silva Leal, Adriane Consuelo [1 ]
Jurelo, Alcione Roberto [1 ]
机构：
[1] Univ Estadual Ponta Grossa, Dept Fis, Ponta Grossa, Brazil
来源：
PHASE TRANSITIONS | 2016年 / 89卷 / 01期
关键词：
high-T-C superconductor; praseodymium; phase transition; critical phenomena; NORMAL-STATE; PR; SUPERCONDUCTIVITY; TEMPERATURE; SUPPRESSION; TRANSITION; BEHAVIOR;
D O I：
10.1080/01411594.2015.1077955
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
Fluctuation-induced conductivity in composite samples (YBa2Cu3O7-)(1-y)-(PrBa2Cu3O7-)(y) was investigated. The samples with 0 <= Y <= 0.1 were produced through the solid-state reaction method. Powder X-ray Rietveld analysis for the composites demonstrated that the patterns are identical to that of YBa2Cu3O7-. From the critical exponent analysis, it could be observed that the transport properties of composites are governed by the presence of two phases: YBa2Cu3O7- and PrBa2Cu3O7-. Splitting of the pairing transition was observed and two critical temperatures were identified, but only one is strongly affected by Pr. The composite structure can be thought as a three-dimensional grain percolation system with the structure of Pr-grain and Y-grain unit cell.
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页码：21 / 36
页数：16
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