Noncollinear Magnetism in Mn2RhSn Heusler Compound
Olga Meshcheriakova (KOMET 5 Institut für Physik)

Heusler compounds is a large class of materials, which exhibits diverse fundamental phenomena, together with the possibility of their specific tailoring for various engineering demands. Present work discusses the magnetic non-collinearity in the family of noncentrosymmetric ferrimagnetic Mn2-based Heusler compounds. Based on the obtained experimental and theoretical results, Mn2Y Z Heusler family is suspected to provide promising candidates for the formation of the skyrmion lattice. The work is focused on Mn2RhSn bulk polycrystalline sample, which serves as a prototype. It crystallizes in the tetragonal noncentrosymmetric structure (No. 119, I4m2), which enables the anisotropic Dzyaloshinskii-Moriya (DM) exchange coupling. Additional short-range modulation, induced by the competing nearest and next-nearest inter-planes Heisenberg exchange, is suppressed above the 80 K. This allows to develop the long-range modulations in the ideal ferrimagnetic structure within the ab crystallographic planes, and thus, favors to the occurrence of the skyrmion lattice within the temperature range of (80 leqT leq 270) K. The studies of Mn2RhSn were expanded to the broad composition range and continued on thin film samples.