Critical current density behaviors across a grain boundary inclined to current with different angles in YBa2Cu3O7-δ bicrystal junctions

被引：0

作者：

花涛 ^{[1
,2
]}

许伟伟 ^{[2
]}

吉争鸣 ^{[2
]}

郭大元 ^{[2
]}

王青云 ^{[1
]}

马湘蓉 ^{[1
]}

梁瑞宇 ^{[1
]}

机构：

[1] School of Communication Engineering Nanjing Institute of Technology

[2] Research Institute of Superconductor Electronics School of Electronic Science and Engineering Nanjing University

来源：

Chinese Physics B | 2016年 / 06期

基金：

中国国家自然科学基金;

关键词：

grain boundary; bicrystal Josephson junction; inclined angle; high temperature superconductor;

D O I：

暂无

中图分类号：

O511.3 [];

学科分类号：

070205 ; 080705 ;

摘要：

The critical current density behaviors across a bicrystal grain boundary(GB) inclined to the current direction with different angles in YBaCuObicrystal junctions in magnetic fields are investigated.There are two main reasons for the difference in critical current density in junctions at different GB inclined angles in the same magnetic field:(i) the GB plane area determines the current carrying cross section;(ii) the vortex motion dynamics at the GB affects the critical current value when the vortex starts to move along the GB by Lorentz force.Furthermore,the vortex motion in a bicrystal GB is studied by investigating transverse(Hall) and longitudinal current–voltage characteristics(I–Vand I–V).It is found that the I–Vcurve diverges from linearity at a high driving current,while the I–Vcurve keeps nearly linear,which indicates the vortices inside the GB break out of the GB by Lorentz force.

引用

页码：504 / 507

页数：4