J. Phys. IV France 03 (1993) C8-273-C8-278
Vortex lattice structures in YBa2Cu3O7M. YETHIRAJ1, H.A. MOOK1, G.D. WIGNALL1, R. CUBITT2, E.M. FORGAN2, S.L. LEE3, D.M. PAUL4 and T. ARMSTRONG5
1 Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6393, U.S.A.
2 Superconductivity Research Group, University of Birmingham, Birmingham B15 2TT, U.K.
3 Physik-Institut der Universität Zürich, Schönberggasse 9, 8001 Zürich, Switzerland
4 Department of Physics, University of Warwick, Coventry CV4 7AL, U.K.
5 Allied Signal Research Laboratories, Torrance, CA 90509, U.S.A.
We describe small-angle neutron scattering (SANS) studies of vortex structures in the high Tc superconductor YBa2Cu3O7 in the mixed state. The SANS technique is a unique tool for probing the crystallography of a flux line arrangement in the bulk sample that can measure the values of the characteristic lengths and the effect of defects on lattice arrangement and orientation extremely accurately. The effects of crystal anisotropy on the field distribution in a vortex line is the topic of this paper.
© EDP Sciences 1993