Thermally activated spontaneous fluxoid formation in superconducting thin film rings

被引：48

作者：

Kirtley, JR

Tsuei, CC

Tafuri, F

机构：

[1] IBM Corp, Thomas J Watson Res Ctr, Yorktown Hts, NY 10598 USA

[2] Seconda Univ Napoli, INFM Coherentia Dipartimento Ingn Informaz, Aversa, CE, Italy

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 25期

关键词：

D O I：

10.1103/PhysRevLett.90.257001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have observed spontaneous fluxoid generation in thin film rings of the amorphous superconductor Mo3Si, cooled through the normal-superconducting transition, as a function of quench rate and externally applied magnetic field, using a variable sample temperature scanning SQUID microscope. Our results can be explained using a model of freeze-out of thermally activated fluxoids, mediated by the transport of bulk vortices across the ring walls. This mechanism is complementary to a mechanism proposed by Kibble and Zurek, which only relies on causality to produce a freeze-out of order parameter fluctuations.

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页数：4

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