Transverse-field components of the flux-line lattice in the anisotropic superconductor YBa2Cu3O7-delta - art. no. 174501

We report on detailed small-angle neutron scattering measurements with pola rization analysis from the flux-line lattice in the anisotropic superconduc tor YBa2Cu3O7-delta. When the field was applied at an angle to the principa l axes we have observed spin-flip neutron diffraction consistent with local transverse field components. From a detailed study of the angle dependence of the magnitude of the spin-flip neutron-scattered intensity we have foun d that the trans verse-field components are larger than predicted by an ani sotropic London model for reasonable mass anisotropy values. The transverse -field components are consistent with a reduced c-axis coherence length at low temperature.