DETERMINATION OF FLUX-DENSITY GRADIENTS IN YBA2CU3O7-DELTA SUPERCONDUCTORS USING THE HIGH-RESOLUTION FARADAY-EFFECT

被引：61

作者：

KOBLISCHKA, MR ^{[1
]}

MOSER, N ^{[1
]}

GEGENHEIMER, B ^{[1
]}

KRONMULLER, H ^{[1
]}

机构：

[1] MAX PLANCK INST FESTKORPERFORSCH,W-7000 STUTTGART 80,GERMANY

来源：

PHYSICA C | 1990年 / 166卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(90)90549-T

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Domain patterns of magnetic flux penetrated in YBa2Cu3O7-δ superconductors have been observed by means of a high-resolution Faraday technique. The experimental conditions for observing domain patterns with the high-resolution Faraday effect are discussed. Flux-density profiles and the related flux-density gradients were determined from an analysis of the domain patterns. An analysis of the measured flux-density gradients in single-crystals shows that twin-boundaries are not the strongest acting pinning mechanism at low temperatures. Our results support the assumption that intrinsic pinning determines the flux-density gradients and governs the critical currents. It is shown that the flux-density gradients in grains of the sintered specimens are larger than in single-crystals. The resulting thirty times greater pinning forces are measured both magneto-optically and with a SQUID-magnetometer. This behaviour may be explained by superimposed extrinsic pinning effects such as grain-boundaries. © 1990.

引用

页码：36 / 48

页数：13

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