TIME-DEPENDENT OXYGEN ORDERING AND ITS EFFECT ON TC IN OFF-STOICHIOMETRIC YBA2CU3OZ

被引：67

作者：

CEDER, G ^{[1
]}

MCCORMACK, R ^{[1
]}

DEFONTAINE, D ^{[1
]}

机构：

[1] UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720

来源：

PHYSICAL REVIEW B | 1991年 / 44卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.44.2377

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The increase in T(c) recently observed by Veal et al. and Jorgensen et al. during room-temperature aging of quenched YBa2Cu3Oz samples is explained by studying the microscopic changes that take place in a simulated aging experiment. Monte Carlo simulation shows that the threefold coordinations of oxygen around Cu in the basal plane are converted into twofold and threefold coordinations during room-temperature aging. The hole doping induced by this conversion results in the increase in T(c). Both tetragonal-orthorhombic ordering and additional superstructure ordering are responsible for the observed changes in Cu coordinations. It is shown that aging of samples with high oxygen content will not significantly increase T(c).

引用

页码：2377 / 2380

页数：4

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