Vortex Trapping and Expulsion in Thin-Film Type-II Superconducting Strips

Author

Kuit, Kristiaan H. ; Kirtley, John R. ; Clem, John R. ; Rogalla, Horst ; Flokstra, Jaap

Author_Institution

Mesa+ Inst. for Nanotechnol., Univ. of Twente, Enschede, Netherlands

Volume

19

Issue

3

fYear

2009

fDate

6/1/2009 12:00:00 AM

Firstpage

3537

Lastpage

3540

Abstract

Vortex trapping is investigated in thin-film strips of superconducting material. We present a model for the critical field above which vortex trapping occurs in these strips. This model includes the pairing energy of vortex-antivortex pairs in addition to the energy of single vortices. Experimental verification of the model with a scanning SQUID microscope shows very good agreement between the model and experiments on YBa₂Cu₃O_7-delta and Nb strips. Statistical analysis of the vortex distribution in the strips above the critical field has been performed and a comparison has been made between Nb and YBa₂Cu₃O_7-delta for the distributions in the lateral and longitudinal directions.

Keywords

SQUIDs; barium compounds; high-temperature superconductors; superconducting thin films; type II superconductors; yttrium compounds; YBa₂Cu₃O_7-delta; scanning SQUID microscope; statistical analysis; thin film strips; type-II superconducting strips; vortex expulsion; vortex trapping; vortex-antivortex pairs; Critical field; scanning SQUID microscope; vortex trapping;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2009.2018080

Filename

5067210