Multilevel granular structure and its coupling distribution in melt-textured YBa2Cu3O7-δ

被引：15

作者：

Araújo-Moreira, FM

Ortiz, WA

de Lima, OF ^{[1
]}

机构：

[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazil

[2] Univ Fed Sao Carlos, Dept Fis, Grp Supercondut & Magnetismo, BR-13565905 Sao Carlos, SP, Brazil

来源：

PHYSICA C | 1999年 / 311卷 / 1-2期

基金：

巴西圣保罗研究基金会;

关键词：

AC susceptibility; critical current density; granular superconductivity; couplings distribution;

D O I：

10.1016/S0921-4534(98)00618-2

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have performed AC magnetic susceptibility measurements as a function of the excitation magnetic field, h, for two YBa2Cu3O7-delta polycrystalline samples using a high-sensitivity home-made susceptometer, for fixed values of the temperature, T, and the external DC magnetic field, H, One of the samples is melt-textured and for H < 52.5 Oe it presents features that can be associated with a multilevel granular structure. Using an effective medium model, we have determined the critical current density distribution associated with the multilevel granular structure. The average critical current density in each intergranular region was then calculated by applying Bean's critical state model. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

收藏

页码：98 / 106

页数：9

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