Magneto-optical studies of the uniform critical state in bulk MgB2

被引：25

作者：

Polyanskii, AA ^{[1
]}

Gurevich, A

Jiang, J

Larbalestier, DC

Bud'ko, SL

Finnemore, DK

Lapertot, G

Canfield, PC

机构：

[1] Univ Wisconsin, Ctr Appl Superconduct, Madison, WI 53706 USA

[2] Iowa State Univ Sci & Technol, Ames Lab, US Dept Energy, Ames, IA 50011 USA

[3] Iowa State Univ Sci & Technol, Dept Phys & Astron, Ames, IA 50011 USA

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2001年 / 14卷 / 10期

关键词：

D O I：

10.1088/0953-2048/14/10/301

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We present a detailed magneto-optical investigation of the magnetic flux penetration in polycrystalline MgB2 slabs made by direct reaction of B and Mg. Our results unambiguously indicate a uniform, Bean critical state magnetization behaviour with almost no electromagnetic granularity. From the measured magnetic flux profiles we were able to extract the temperature dependence of the critical current density J(c)(T). The J(c)(T) value reaches 1.8 x 10(5) A cm(-2) at 10 K and 0.12 T, in good agreement with global magnetization measurements.

引用

页码：811 / 815

页数：5

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