Systematic cation disorder effects in L1.85M0.15CuO4 superconductors

被引：26

作者：

McAllister, JA

Attfield, JP

机构：

[1] Univ Cambridge, Dept Chem, Cambridge CB2 1EW, England

[2] Univ Cambridge, Interdisciplinary Res Ctr Superconduct, Cambridge CB3 0HE, England

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 83卷 / 16期

关键词：

D O I：

10.1103/PhysRevLett.83.3289

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The properties of three series of (La, Nd)(1.85)(Ca,Sr,Ba)(0.15)CuO4 samples have been investigated. In each series the mean A-site cation radius is fixed, but the size variance sigma(2) changes. Susceptibility and transport measurements show that this leads to hole trapping within the CuO2 planes which rapidly suppresses superconductivity in the same manner as the substitution of diamagnetic elements such as Zn for Cu. Cation size disorder also stabilizes low temperature distorted superstructures of the basic tetragonal La2CuO4-type structure. The superconducting critical temperature and the orthorhombic-to-tetragonal structural transition both show a strong linear dependence on sigma(2).

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收藏

页码：3289 / 3292

页数：4

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