Giant topological Hall effect in centrosymmetric tetragonal Mn2−xZnxSb

Abstract

Topological magnetism typically appears in noncentrosymmetric compounds or compounds with geometric frustration. Here, we report the effective tuning of magnetism in centrosymmetric tetragonal ${\mathrm{Mn}}_{2\ensuremath{-}x}{\mathrm{Zn}}_{x}\mathrm{Sb}$ by Zn substitution. The magnetism is found to be closely coupled to the transport properties, giving rise to a very large topological Hall effect with fine-tuning of Zn content, which even persists to high temperature $(\ensuremath{\sim}250\phantom{\rule{0.16em}{0ex}}\mathrm{K})$. The further magnetoentropic analysis suggests that the topological Hall effect is possibly associated with topological magnetism. Our finding suggests ${\mathrm{Mn}}_{2\ensuremath{-}x}{\mathrm{Zn}}_{x}\mathrm{Sb}$ is a candidate material for a centrosymmetric tetragonal topological magnetic system, offering opportunities for studying and tuning spin textures and developing near room temperature spin-based devices.