Title :
Observations of vortex structure in YBa2Cu3O 7
Author :
Muller, H. ; Wiesmann, H.J. ; Suenaga, M.
Author_Institution :
Div. of Mater. Sci., Brookhaven Nat. Lab., Upton, NY, USA
fDate :
3/1/1991 12:00:00 AM
Abstract :
The remnant magnetic flux distribution in a single crystal and a sintered polycrystal was examined using the magnetic particle decoration technique. The single crystal, which was heavily twinned, showed only local order in the flux lattice. This was probably due to lattice distortions caused by interaction between twin boundaries and fluxons. In the polycrystal, flux pinning effectiveness was seen to vary significantly between grains, depending on size and orientation. Grains with the c axis nearly perpendicular to the applied magnetic field were most effective at pinning flux. Some features of the decoration patterns implied that the flux distribution was influenced by more than just the grains at the sample surface
Keywords :
barium compounds; flux pinning; flux-line lattice; high-temperature superconductors; yttrium compounds; flux lattice; flux pinning; fluxons; high temperature superconductivity; lattice distortions; local order; magnetic particle decoration technique; remnant magnetic flux distribution; single crystal; sintered polycrystal; twin boundaries; vortex structure; Atmosphere; Copper; Crystal microstructure; Electrons; Grain boundaries; Helium; Iron; Nickel; Superconducting filaments and wires; Superconducting transition temperature;
Journal_Title :
Magnetics, IEEE Transactions on
