Influence of magnetic field on the flux motion in superconducting YBCO/PYBCO superlattice

Author

Horng, H.E. ; Yang, S.Y. ; Jeng, J.T. ; Wu, J.M. ; Yang, H.C.

Author_Institution

Dept. of Phys., Nat. Taiwan Univ., Taipei, Taiwan

Volume

7

Issue

2

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

1177

Lastpage

1180

Abstract

Angular dependent critical current densities J/sub c/(H,/spl theta/) for the YBa/sub 2/Cu/sub 3/O/sub 7-y//Pr/sub 0.5/Y/sub 0.5/Ba/sub 2/Cu/sub 3/O/sub 7-y/ (120 /spl Aring//24 /spl Aring/)/spl times/8 superlattice under various magnetic fields were measured to investigate the influence of the applied magnetic fields on the dimensionality of the flux pinning and flux dynamics. J/sub c/(H,/spl theta/) was obtained by applying current through x- or y-direction and analyzed by Kes model. It is found that the dissipation of the flux line system in the mixed state is mainly due to the pancake motion along ab-plane as H<1 T, while the flux lines begin to move along c-axis when the magnetic field reached 1 T. The causes will be discussed.

Keywords

barium compounds; critical current density (superconductivity); flux creep; flux pinning; flux-line lattice; high-temperature superconductors; mixed state; praseodymium compounds; superconducting superlattices; yttrium compounds; 120 A; 24 A; Kes model; YBa/sub 2/Cu/sub 3/O/sub 7-y//Pr/sub 0.5/Y/sub 0.5/Ba/sub 2/Cu/sub 3/O/sub 7-y/; YBa/sub 2/Cu/sub 3/O/sub 7/-Pr/sub 0.5/Y/sub 0.5/Ba/sub 2/Cu/sub 3/O/sub 7/; angular dependent critical current densities; flux dynamics; flux line system; flux motion; flux pinning; high temperature superconductor; magnetic field; mixed state; superconducting YBCO/PYBCO superlattice; Critical current density; Current measurement; Density measurement; Flux pinning; Magnetic field measurement; Magnetic fields; Magnetic superlattices; Physics; Temperature; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.620703

Filename

620703