Effects of nonmagnetic Cr substitution for Mn on kagome magnet DyMn6Sn6.

Abstract

RMn6Sn6 (R = rare-earth) kagome magnets have been one of the research focuses in condensed matter physics, primarily due to their exotic physical properties rooted in the interplay between magnetism and nontrivial topological band structures. We reported herein the crystal growth of Cr substituted DyMn4Cr2Sn6 and investigations on their magnetotransport properties. It is unveiled that the Mn kagome layer is destroyed and the in-plane ferromagnetic exchange is consequently weakened by the substituted nonmagnetic Cr. Furthermore, the substitution apparently benefits reorientations of the Mn spins under external magnetic field. Besides, the Cr substitution results in a significantly enhanced large intrinsic anomalous Hall conductivity, reaching 600 S cm-1 at 240 K. The anomaly observed in the anomalous Hall conductivity as well as in the Hall coefficient might indicate a topological magnetic structure formed during the spin reorientation process. These findings pave the way for manipulating magnetism and electronic structures in magnetic kagome topological phases and offer a fertile ground for discovering exotic topological properties.