DEMAGNETIZING FIELDS AND OTHER SHAPE EFFECTS IN HIGH-TC CERAMICS

被引：36

作者：

SENOUSSI, S ^{[1
]}

HADJOUDJ, S ^{[1
]}

MAURY, R ^{[1
]}

FERT, A ^{[1
]}

机构：

[1] INST NATL SCI APPL,PHYS SOLIDES LAB,F-31077 TOULOUSE,FRANCE

来源：

PHYSICA C | 1990年 / 165卷 / 5-6期

关键词：

D O I：

10.1016/0921-4534(90)90368-O

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report magnetic measurements on sintered pellets of YBa2Cu3O7 (for different radii R of the macroscopic samples) and on oriented grains dispersed in epoxy resin. We show that, for highly compact specimens with packing factors > 85%, the demagnetizing factor is imposed by the macroscopic shape of the sample. On the contrary, when the packing factor is lower than about 10%, it is governed (on average) by the geometrical form of the individual grains. After correcting for demagnetizing effects, the low field data (H ≤ 5 G) can be described by an effective penetration depth λeff of the order of 20 μm in the present case. This parameter depends on imperfections of the surface of the pellet. © 1990.

引用

页码：364 / 370

页数：7

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