Magnetic and electronic structure of the topological semimetal YbMnSb${}_2$

Abstract

The antiferromagnetic (AFM) semimetal YbMnSb${}_2$ has recently been identified as a candidate topological material, driven by time-reversal symmetry breaking. Depending on the ordered arrangement of Mn spins below the Néel temperature, $T_{\mathrm{N}}$ = 345 K, the electronic bands near the Fermi energy can ether have a Dirac node, a Weyl node or a nodal line. We have investigated the ground state magnetic structure of YbMnSb${}_2$ using unpolarized and polarized single crystal neutron diffraction. We find that the Mn moments lie along the $c$ axis of the $P4/nmm$ space group and are arranged in a C-type AFM structure, which implies the existence of gapped Dirac nodes near the Fermi level. The results highlight how different magnetic structures can critically affect the topological nature of fermions in semimetals.

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• Canted Antiferromagnetic phases in the layered candidate Weyl material EuMnSb${}_2$
• Topological electronic bands in crystalline solids
• Magnetic excitations in the topological semimetal ${\mathrm{YbMnSb}}_2$
• Ultrafast photoinduced phase transition in the antiferromagnetic Dirac semimetal EuAgAs
• Coupling of magnetism and Dirac fermions in YbMnSb2
• C-type antiferromagnetic structure of topological semimetal CaMnSb${}_2$
• Spin waves in Dirac semimetal Ca${}_{0.6}$Sr${}_{0.4}$MnSb${}_2$ investigated with neutrons by the diffraction method