Magnetic-Flux Penetration and Critical Currents in Superconducting Strips with Slits

Yasunori Mawatari; John R. Clem

doi:10.1103/PhysRevLett.86.2870

Magnetic-Flux Penetration and Critical Currents in Superconducting Strips with Slits

Yasunori Mawatari and John R. Clem

Phys. Rev. Lett. 86, 2870 – Published 26 March 2001

Abstract

We theoretically investigate transport-current-induced magnetic-flux penetration into superconducting strip lines with slits. Even when the individual strips have no bulk pinning, geometrical barriers prevent penetration of magnetic flux into the innermost strips while flux quasistatically penetrates into the outermost slits. The critical current of strip lines with $2 N$ slits at zero applied magnetic field is found to be enhanced by a factor of $(N + 1)^{1 / 2}$ above that of a single strip line without slits. Under suitable conditions, a domelike flux distribution due to the geometrical barrier can appear in the individual strips even in the absence of an applied magnetic field.

Received 22 November 2000

DOI:https://doi.org/10.1103/PhysRevLett.86.2870

Authors & Affiliations

Yasunori Mawatari¹ and John R. Clem²

¹Energy Electronics Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305–8568, Japan
²Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011–3160