Here, the effect of residual strain generated by uniaxial stress applied to polycrystalline Mn3Sn on magnetic properties and Hall effect is investigated. Contrary to the role of pressure in Mn3Sn, both Hall measurements and our theoretically calculated kagome lattice distortions suggest that residual strain is beneficial for suppressing the magnetic transition from the inverse triangular AFM state to the helical AFM state. Furthermore, the topological Hall effect is observed in Mn3Sn over the entire temperature range from 5 K to 400 K due to residual strain. Combined with the magnetic measurements, we speculate that THE originates from residual strain-induced non-coplanar AFM structure. Our findings point out a method to realize the chiral non-coplanar AFM structure through strain engineering, thereby providing a path for the construction of topological antiferromagnets.
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