Canted Antiferromagnetic phases in the layered candidate Weyl material EuMnSb2

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Wilde, John M.
Riberolles, Simon X. M.
Das, Atreyee
Liu, Y.
Heitmann, T. W.
Wang, X.
Straszheim, Warren E.
Bud'ko, Sergey L.
Kreyssig, Andreas
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Iowa State University Digital Repository, Ames IA (United States)
Canfield, Paul
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EuMnSb2 is a candidate topological material which can be tuned towards a Weyl semimetal, but there are differing reports for its antiferromagnetic (AFM) phases. The coupling of bands dominated by pure Sb layers hosting topological fermions to Mn and Eu magnetic states provides a potential path to tune the topological properties. We present a detailed analysis of the magnetic structure on three AFM phases based on single-crystal neutron diffraction, magnetization, and heat capacity data as well as polycrystalline 151Eu Mössbauer data. The Mn magnetic sublattice orders into a C-type AFM structure below 323(1)~K with the ordered Mn magnetic moment μMn lying perpendicular to the layers. AFM ordering of the Eu sublattice occurs below 23(1)~K with the ordered Eu magnetic moment μEu canted away from the layer normal and μMn retaining its higher-temperature order. μEu is ferromagnetically aligned within each Eu layer but exhibits a complicated AFM layer stacking. Both of these higher-temperature phases are described by magnetic space group (MSG) Pn′m′a′ with the chemical and magnetic unit cells having the same dimensions. Cooling below =9(1)~K reveals a third AFM phase where μMn remains unchanged but μEu develops an additional in-plane canting. This phase has MSG P1121a′. We additionally find evidence of short-range magnetic correlations associated with the Eu between 12 K≲T≲30 K. Using the determined magnetic structures, we postulate the signs of nearest-neighbor intralayer and interlayer exchange constants and the magnetic anisotropy within a general Heisenberg-model. We then discuss implications of the various AFM states in EuMnSb2 and its topological properties.
This article is published as Wilde, John M., Simon XM Riberolles, Atreyee Das, Y. Liu, T. W. Heitmann, Xiaoping Wang, Warren E. Straszheim et al. "Canted antiferromagnetic phases in the candidate layered Weyl material EuMnSb 2." Physical Review B 106, no. 2 (2022): 024420. DOI: 10.1103/PhysRevB.106.024420. Copyright 2022 American Physical Society. Posted with permission. DOE Contract Number(s): AC02-07CH11358; AC05-00OR22725.