TWIN-BOUNDARY PINNING AND FLUX FLOW IN ZONE-MELT-TEXTURED YBA2CU3O7-DELTA CRYSTALS

被引：19

作者：

BLACKSTEAD, HA

PULLING, DB

MCGINN, PJ

CHEN, WH

机构：

[1] Physics Department, University of Notre Dame, Notre Dame, 46556, Indiana

[2] Electrical Engineering Department, University of Notre Dame, Notre Dame, 46556, Indiana

来源：

JOURNAL OF SUPERCONDUCTIVITY | 1991年 / 4卷 / 04期

关键词：

FLUX FLOW; TWIN-BOUNDARY PINNING; PHASE SLIP; SURFACE RESISTANCE;

D O I：

10.1007/BF00618147

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Using a microwave (13 GHz) technique which is sensitive to field-induced changes in the surface resistance, we have observed twin-boundary pinning in zone-melt-textured crystals of YBa2Cu3O7-delta. With the rotation of a static 1.9-T field applied in the a-b plane, the surface resistance R(s) exhibits minima at 90-degrees intervals. The twin-boundary minima are shown to be connected to the orientation of the crystalline axes of the sample. The resistance minima are observed superimposed on a flux-flow response over the temperature range of T(c) to the lowest temperature attempted. Substantial flux mobility is observed to the lowest temperatures. The angular dependence of the flux-flow response at low temperatures is consistent with the "brick" model for local intergranular conductivity, which provides for an in-plane isotropic component.

引用

页码：263 / 269

页数：7

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