Formation of a magnetic soliton lattice in copper metaborate.

The magnetic ground-state of copper metaborate is investigated by means of elastic neutron scattering.The magnetic structure of CuB2O4 is incommensurate with respect to the chemical lattice at T=1.8K and undergoes a continuous phase transition to a non-collinear commensurate antiferromagnetic state which is realized at T=10K. Close to the phase transition higher-order magnetic satellites are observed. Coexistence of long-range and short range magnetic order observed in both magnetic phases. This suggests that the association of the Dzyialoshinskii-Moriya interaction, lattice symmetry and tetragonal anisotropy leads to the formation of a three-dimensional magnetic soliton lattice.