Observation of a Single Crystal of Vortex Lines in a Type-II Superconductor

Abstract
A quasiperfect crystal of vortex lines was observed by neutron diffraction. The quality of the crystal allows the direct detection and measurement of the relative intensities at the Bragg peaks [10], [20], and [11] (in the reciprocal space of the two-dimensional lattice) and gives, for the first time, the possibility of mapping the magnetic field of the mixed state.