QUANTUM DIMENSIONAL EFFECT IN POWDERS OF THE HIGH-TC SUPERCONDUCTOR YBA2CU3O7-DELTA

被引：15

作者：

FLEISHER, V ^{[1
]}

LAHDERANTA, E ^{[1
]}

LAIHO, R ^{[1
]}

STEPANOV, YP ^{[1
]}

机构：

[1] AF IOFFE PHYSICOTECH INST,194021 LENINGRAD,USSR

来源：

PHYSICA C | 1990年 / 170卷 / 1-2期

关键词：

15;

D O I：

10.1016/0921-4534(90)90242-7

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Low-field magnetization has been investigated in powders of YBa2Cu3O7-δ using samples with different maximal characteristic particle sizes dmax of between 2.4 and 7.4 μm. Measurements of the thermoremanent magnetization reveal the existence of a threshold field Hth corresponding to trapping of a single flux quantum Φ0 in microcrystal: Hth=(1.1±0.2) Φ0/d2max. Flux creep was found to depend on the grain size, giving evidence for the presence of a surface barrier of flux trapping. A reversible temperature dependence of the thermoremanent magnetization has been observed. This effect is attributed to a local field created by particles containing trapped flux. © 1990.

引用

页码：161 / 165

页数：5

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