Split of the magnetic and crystallographic states in Fe_1-xRh_xGe

We report on a comprehensive experimental and theoretical study of the Fe1-xRhxGe compounds, within the entire concentration range x is an element of [0.0 - 1.0], using X-Ray diffraction, small-angle neutron scattering, magnetometry and theoretical calculations. While FeGe and RhGe are single phase helimagnet and un-conventional superconductor, respectively, an internal splitting of the crystallographic and magnetic states is found for intermediate compositions x is an element of [0.2 - 0.9]. A theoretical analysis of the stability of the two detected phases, together with the experimental data, indicate that this splitting preserves a common space group and occurs within single crystallites. Despite their apparent similarity, these two phases however display different magnetic structures, with distinct ferro-and helimagnetic character.(c) 2022 Elsevier B.V. All rights reserved.