SUPERCONDUCTIVITY AND LOW-TEMPERATURE STRUCTURAL PHASE-TRANSITION IN LA1.98-XCE0.02BAXCUO4

被引：42

作者：

KOIKE, Y

KAWAGUCHI, T

WATANABE, N

NOJI, T

SAITO, Y

机构：

[1] Department of Applied Physics, Faculty of Engineering, Tohoku University, Aoba-ku, Sendai, 980, Aramaki Aoba

来源：

SOLID STATE COMMUNICATIONS | 1991年 / 79卷 / 02期

关键词：

D O I：

10.1016/0038-1098(91)90081-6

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Effects of the partial substitution of Ce for La on the superconductivity and the low-temperature structural phase transition have been investigated in La2-xBa(x)CuO4. The local minimum of T(c) as a function of Ba concentration x, appearing near x = 0.125 for La2-xBa(x)CuO4, clearly shifts to x = 0.145 for La1.98-xCe0.02Ba(x)CuO4. The range of x, where a resistance minimum relating to the low-temperature structural phase transition appears, shifts to that of larger x values, too. These suggest that the low-temperature structural phase transition around x = 0.125 in La2-xBa(x)CuO4 is due to the optimum hole concentration of 0.125 per Cu atom rather than plausible atomic ordering of La and Ba.

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页码：155 / 158

页数：4

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