EFFECTS OF CU SUBSTITUTION BY FE ON THE MAGNETIC-PROPERTIES OF YBA2CU3O7-Y SINGLE-CRYSTALS

被引：28

作者：

LAN, MD

LIU, JZ

SHELTON, RN

机构：

[1] Department of Physics, University of California, Davis, Davis

来源：

PHYSICAL REVIEW B | 1991年 / 43卷 / 16期

关键词：

D O I：

10.1103/PhysRevB.43.12989

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report magnetization measurements on single crystals in the system YBa2Cu(3-x)Fe(x)O7-y, with Fe concentration x up to 0.24. The relation between the superconducting properties and twin boundaries is discussed. Our results indicate that a model of higher-T(c) regions in the twin boundaries seems incorrect. An anti-Meissner effect and crossover in the low-temperature inductive J(c) measurements are observed, which indicate a possible pinning mechanism due to twin boundaries. A positive curvature to the H(c1)-versus-temperature data suggests a strong temperature dependence of the Ginzburg-Landau parameters. No single pinning mechanism is dominant over the entire temperature and magnetic-field range in these oxide superconductors.

引用

页码：12989 / 12993

页数：5

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