MICROWAVE SURFACE-RESISTANCE AND VORTICES IN HIGH-TC SUPERCONDUCTORS - OBSERVATION OF FLUX PINNING AND FLUX CREEP

被引：56

作者：

JI, L ^{[1
]}

RZCHOWSKI, MS ^{[1
]}

TINKHAM, M ^{[1
]}

机构：

[1] HARVARD UNIV,DIV APPL SCI,CAMBRIDGE,MA 02138

来源：

PHYSICAL REVIEW B | 1990年 / 42卷 / 07期

关键词：

D O I：

10.1103/PhysRevB.42.4838

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

History dependence and logarithmic time dependence of the microwave surface resistance have been observed in polycrystalline YBa2Cu3O7-x in a magnetic field. We interpret our data in terms of granularity and use the model of Gittleman and Rosenblum to relate the surface resistance to the number of vortices in the sample. At a given field, we find that the surface resistance of a zero-field-cooled sample is higher than that of a field-cooled sample, suggesting that the former contains more intergranular vortices. It is also observed that once the external dc field is removed, flux creep out of the sample results in a logarithmic time decay of the surface resistance, from which we estimate a thermal activation energy at 77 K of about 0.1 eV. © 1990 The American Physical Society.

引用

页码：4838 / 4841

页数：4

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