Anisotropic flux pinning in YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// single crystals

Author

Pan, V.M. ; Solovjov, V.F. ; Svetchnikov, V.L. ; Freyhardt, H.C.

Author_Institution

Inst. for Metal Phys., Kiev, Ukraine

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

1892

Lastpage

1895

Abstract

Direct transport measurements of the critical currents as well as their angular and field dependencies in YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// single crystals were performed. The role of twin planes as extended defects, which provide a vortex locking, is studied and their contribution to the J/sub c/ anisotropy is analyzed. The angular dependence of the critical current is represented as a combination of a contribution from extended defects and a point-like-defect-induced anisotropic background. The latter is responsible for the major part of the measured J/sub c/ anisotropy. The observed Kramer-like scaling law concerning the dependencies of the volume pinning force versus the applied magnetic field component along the c-axis indicates a three-dimensional flux line lattice behavior and excludes vortex decoupling as a possible mechanism of the "fishtail-effect".<>

Keywords

barium compounds; critical current density (superconductivity); flux pinning; high-temperature superconductors; twin boundaries; yttrium compounds; 3D flux line lattice; Kramer-like scaling law; YBa/sub 2/Cu/sub 3/O/sub 7/; angular dependence; anisotropic flux pinning; critical currents; extended defects; fishtail-effect; high temperature superconductor; single crystals; twin planes; volume pinning force; vortex locking; Anisotropic magnetoresistance; Critical current; Crystallization; Crystals; Flux pinning; Lattices; Magnetic field measurement; Physics; Temperature dependence; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.402951

Filename

402951