Giant topological Hall effect in centrosymmetric tetragonal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Mn</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Zn</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mi>Sb</mml:mi></mml:mrow></mml:math>
Md Rafique Un Nabi, Aaron Wegner, Fei Wang, Yanglin Zhu, Yingdong Guan, Arash Fereidouni, K. C. Pandey, Rabindra Basnet, Gokul Acharya, Hugh Churchill, Zhiqiang Mao, Jin Hu
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.