Effect of submicron holes on the vortex dynamics of a superconducting microbridge -: art. no. 184516

被引：6

作者：

Bentner, J ^{[1
]}

Babic, D

Sürgers, C

Strunk, C

机构：

[1] Univ Regensburg, Inst Expt & Angew Phys, D-93025 Regensburg, Germany

[2] Univ Zagreb, Fac Sci, Dept Phys, HR-10000 Zagreb, Croatia

[3] Univ Karlsruhe, Inst Phys, D-76128 Karlsruhe, Germany

[4] Univ Karlsruhe, DFG Ctr Funct Nanostruct, D-76128 Karlsruhe, Germany

来源：

PHYSICAL REVIEW B | 2004年 / 70卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.70.184516

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We measured and compared the electric field vs current density characteristics in the vortex state of two amorphous Nb0.7Ge0.3 microbridges, with and without a line of submicron holes patterned along the sample axis. The power dissipation in the perforated sample exhibits a crossover, being reduced at temperatures well below the superconducting transition temperature T-c and unexpectedly enhanced close to T-c. At low temperatures the holes are efficient artificial pinning centers and reduce the average vortex velocity. We argue that the dissipation enhancement close to T-c is a consequence of a combination of the weakened pinning by the holes and an inhomogeneous driving-current distribution in their vicinity, which results in an increased average vortex velocity as well as in a channeling of the vortex motion through the holes.

引用

页码：1 / 5

页数：5

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