VORTEX PHASES AND ENERGY-DISSIPATION IN NARROW NB STRIPS - REDUCTION OF COLLECTIVE PINNING

被引：13

作者：

ANDO, Y ^{[1
]}

KUBOTA, H ^{[1
]}

TANAKA, S ^{[1
]}

AOYAGI, M ^{[1
]}

AKOH, H ^{[1
]}

TAKADA, S ^{[1
]}

机构：

[1] ELECTROTECH LAB,SAKURA,IBARAKI 305,JAPAN

来源：

PHYSICAL REVIEW B | 1993年 / 47卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.47.5481

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A novel size effect in narrow Nb strips in relation to the width w was found in perpendicular fields much higher than H(c1); upon decreasing the width, even at 4.2 K, a linear resistivity at low current densities appeared for w less-than-or-equal-to 1. 12 mum, and the linear resistivity showed an enhancement with decreasing w. This behavior was explained by the reduction of collective pinning which occurs when w becomes comparable to the size of a hopping bundle of vortices. However, if w is further reduced, vortices are pinned individually and the surface barrier acts as a deep pinning potential, which resulted in a recovery of a high J(c). In zero field, these strips showed a clear increase in the critical current density with decreasing w, which agrees well with a calculation which takes into account the current concentration near the ed es.

引用

页码：5481 / 5484

页数：4

共 19 条

[1] SIZE EFFECT IN THE VORTEX-GLASS TRANSITION IN SUBMICRON YBA2CU3OY STRIPS - EVIDENCE FOR SOFTENING OF VORTEX MATTER [J].