CriticalcurrentdensitybehaviorsacrossagrainboundaryinclinedtocurrentwithdifferentanglesinYBa2Cu3O7-δbicrystaljunctions

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

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 YBa2Cu3O7-δ bicrystal 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–Vxx and I–Vxy).It is found that the I–Vxx curve diverges from linearity at a high driving current,while the I–Vxy curve 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