Effect of Ce substitution on the properties of Tl-based superconductors

被引：6

作者：

Hamdan, NM ^{[1
]}

机构：

[1] King Fahd Univ Petr & Minerals, Dept Phys, Dhahran 31261, Saudi Arabia

来源：

JOURNAL OF LOW TEMPERATURE PHYSICS | 1999年 / 117卷 / 5-6期

关键词：

D O I：

10.1023/A:1022567500255

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Samples with nominal composition (Tl0.5Pb0.5)Sr2-xCexCa2Cu3Oy were pre pared with x in the range 0 to 0.5, to investigate the role of charge carrier concentration on the superconducting properties of TI-based materials. The behavior of the normal state resistivity with temperature showed that as x changes from 0 to 0.2, the material moves towards optimally doped state. For higher Ce content the normal state resistivity versus temperature, started deviating from linearity. The onset transition temperature increased gradually by about 6 K as x was increased from 0 to 0.2. The zero resistance transition temperature rapidly decreased for samples with x > 0.2. Furthermore, XRD analysis revealed that x enters the structure of both Tl-1223 and Tl1212. These results are discussed in terms of controlling the hole concentration in the CuO2 planes through Ce4+ replacement of Sr2+. PACS numbers: 74.62.Dh, 74.72.Fq.

引用

页码：1187 / 1191

页数：5

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