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arXiv · 2211.17243

Impact of Dzyaloshinskii-Moriya and anisotropic exchange interactions on the cubic kagome antiferromagnets Mn$_3$X and Mn$_3$AB

J. S. R. McCoombs·A. Zelenskiy·M. L. Plumer·B. W. Southern·T. L. Monchesky
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Abstract

We perform a symmetry analysis of the ABC-stacked kagome planes of Mn atoms common to the $L1_2$ Mn$_3$X and antiperovskite Mn$_3$AB alloys. In addition to the single-ion-anisotropy and Kitaev-type anisotropic exchange known to stabilize 120{\deg} spin structures in these materials, our analysis results in a staggered Dzyaloshinskii-Moriya interaction and further gamma-type anisotropic exchange between nearest-neighbor spins. The presence of these new terms is shown not to affect the energetics of the 120{\deg} ground-states which explains their absence in prior minimal magnetic models. We go on to show, however, that their influence becomes apparent when spin-wave excitations are considered. We highlight these effects by calculating inelastic neutron scattering cross-sections to illustrate experimental means of probing the existence and relative strengths of these cloaked interactions.

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J. S. R. McCoombs, A. Zelenskiy, M. L. Plumer, B. W. Southern, T. L. Monchesky. 2022-11-30. Impact of Dzyaloshinskii-Moriya and anisotropic exchange interactions on the cubic kagome antiferromagnets Mn$_3$X and Mn$_3$AB. https://doi.org/10.1103/physrevb.107.064407

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