Magnetic structure and excitations of the topological semimetal YbMnBi${}_2$

Abstract

We investigated the magnetic structure and dynamics of YbMnBi${}_2$, with elastic and inelastic neutron scattering, to shed light on the topological nature of the charge carriers in the antiferromagnetic phase. We confirm C-type antiferromagnetic ordering of the Mn spins below $T_{\mathrm{N}}=290$ K, and determine that the spins point along the $c$-axis to within about $3^{\circ }$. The observed magnon spectrum can be described very well by the same effective spin Hamiltonian as was used previously to model the magnon spectrum of CaMnBi${}_2$. Our results show conclusively that the creation of Weyl nodes in YbMnBi${}_2$ by the time-reversal-symmetry breaking mechanism can be excluded in the bulk.

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• Interplay of Dirac electrons and magnetism in AMnBi2 (A=Ca, Sr)
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• Observation of two-dimensional Fermi surface and Dirac dispersion in YbMnSb${}_2$
• Electrodynamic response of type II Weyl semimetals
• Unusual interlayer quantum transport behavior caused by the zeroth Landau level in YbMnBi2
• An optical investigation of the strong spin-orbital coupled magnetic semimetal YbMnBi${}_2$
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• Polarized neutron scattering on HYSPEC: the HYbrid SPECtrometer at SNS
• Spindynamics in the antiferromagnetic phases of the Dirac metals $A$MnBi${}_2$ ($A=$ Sr, Ca)

Cited by in corpus (15)

• Evidence for a magnetic-field induced ideal type-II Weyl state in antiferromagnetic topological insulator Mn(Bi1-xSbx)2Te4
• Single pair of Weyl nodes in the spin-canted structure of EuCd${}_2$As${}_2$
• Magnetic structures, spin-flop transition and coupling of Eu and Mn magnetism in the Dirac semimetal EuMnBi${}_2$
• Magnetic and electronic structure of the topological semimetal YbMnSb${}_2$
• Origin of the Type-II Weyl state in topological antiferromagnetic YbMnBi2
• Onsager reciprocal relation between anomalous transverse coefficients of an anisotropic antiferromagnet
• Spin dynamics of a magnetic Weyl semimetal Sr${}_{1-x}$Mn${}_{1-y}$Sb${}_2$
• Ultrahigh Anomalous Nernst Thermopower and Thermal Hall Angle in YbMnBi2
• Spin Dynamics in the Antiferromagnetic Oxypnictides and Fluoropnictides: LaMnAsO, LaMnSbO, and BaMnAsF
• Giant anomalous Nernst signal in the antiferromagnet YbMnBi2
• Magnetic excitations in the topological semimetal ${\mathrm{YbMnSb}}_2$
• Topological Signatures in Nodal Semimetals through Neutron Scattering
• C-type antiferromagnetic structure of topological semimetal CaMnSb${}_2$
• Coupling of magnetism and Dirac fermions in YbMnSb2
• Spin waves in Dirac semimetal Ca${}_{0.6}$Sr${}_{0.4}$MnSb${}_2$ investigated with neutrons by the diffraction method