Commensurability effects in superconducting Nb films with quasiperiodic pinning arrays

被引：78

作者：

Kemmler, M.

Guerlich, C.

Sterck, A.

Poehler, H.

Neuhaus, M.

Siegel, M.

Kleiner, R.

Koelle, D.

机构：

[1] Univ Tubingen, Phys Inst Expt Phys 2, D-72076 Tubingen, Germany

[2] Univ Karlsruhe, IMS, D-76187 Karlsruhe, Germany

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 14期

关键词：

D O I：

10.1103/PhysRevLett.97.147003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study experimentally the critical depinning current I-c versus applied magnetic field B in Nb thin films which contain 2D arrays of circular antidots placed on the nodes of quasiperiodic (QP) fivefold Penrose lattices. Close to the transition temperature T-c we observe matching of the vortex lattice with the QP pinning array, confirming essential features in the I-c(B) patterns as predicted by Misko et al. [Phys. Rev. Lett. 95, 177007 (2005)]. We find a significant enhancement in I-c(B) for QP pinning arrays in comparison to I-c in samples with randomly distributed antidots or no antidots.

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页数：4

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