STRONG MAGNETIC-FIELD DEPENDENCE OF THE CRITICAL CURRENTS CORRELATED TO THE MICROSTRUCTURE OF YBACUO CERAMICS

被引：14

作者：

DAI, U

DEUTSCHER, G

LACOUR, C

LAHERLACOUR, F

MOCAER, P

LAGUES, M

机构：

[1] ECOLE SUPER PHYS & CHIM IND,MICROSTRUCT LAB,F-75231 PARIS 05,FRANCE

[2] ECOLE SUPER PHYS & CHIM IND,PHYS QUANT LAB,CNRS,URA 421,F-75231 PARIS 05,FRANCE

来源：

APPLIED PHYSICS LETTERS | 1990年 / 56卷 / 13期

关键词：

D O I：

10.1063/1.102537

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Critical currents of YBaCuO ceramics were measured at 77 K by transport measurements in an applied magnetic field H. A hysteretic behavior between 10 and 10 000 G was observed. For decreasing fields, the critical current J c obeys a power law H-n with n ranging between 0.6 and 2.8. The exponent n is correlated with the microstructure and the average grain size of the ceramic. This power law behavior is discussed in terms of modified flux creep and flux flow regimes related to the microstructure.

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页码：1284 / 1286

页数：3

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