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We have observed a magnetic vortex lattice (VL) in BaFe2(As_{0.67}P_{0.33})2(BFAP) single crystals by small-angle neutron scattering (SANS). With the fieldalong the c-axis, a nearly isotropic hexagonal VL was formed in the field rangefrom 1 to 16 T, which is a record for this technique in the pnictides, and nosymmetry changes in the VL were observed. The temperature-dependence of the VLsignal was measured and confirms the presence of (non d-wave) nodes in thesuperconducting gap structure for measurements at 5 T and below. The nodaleffects were suppressed at high fields. At low fields, a VL reorientationtransition was observed between 1 T and 3 T, with the VL orientation changingby 45{\deg}. Below 1 T, the VL structure was strongly affected by pinning andthe diffraction pattern had a fourfold symmetry. We suggest that this (andpossibly also the VL reorientation) is due to pinning to defects aligned withthe crystal structure, rather than being intrinsic.

Vortex lattice structure in BaFe2(As0.67P0.33)2 by the small-angle neutron scattering technique