Effect of chemical inhomogeneity in bismuth-based copper oxide superconductors

被引：404

作者：

Eisaki, H

Kaneko, N

Feng, DL

Damascelli, A

Mang, PK

Shen, KM

Shen, ZX

Greven, M

机构：

[1] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

[2] Stanford Univ, Stanford Synchrotron Radiat Lab, Stanford, CA 94305 USA

来源：

PHYSICAL REVIEW B | 2004年 / 69卷 / 06期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.69.064512

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We examine the effect on the superconducting transition temperature (T-c) of chemical inhomogeneities in Bi2Sr2CuO6+delta and Bi2Sr2CaCu2O8+delta single crystals. Cation disorder at the Sr crystallographic site is inherent in these materials and strongly affects the value of T-c. Partial substitution of Sr by Ln (Ln = La, Pr, Nd, Sm, Eu, Gd, and Bi) in Bi(2)Sr(1.6)Ln(0.4)CuO(6+delta) results in a monotonic decrease of T-c with increasing ionic radius mismatch. By minimizing Sr site disorder at the expense of Ca site disorder, we demonstrate that the T-c of Bi2Sr2CaCu2O8+delta can be increased to 96 K. Based on these results we discuss the effects of chemical inhomogeneity in other bulk high-temperature superconductors.

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页数：8

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