Field-induced spin reorientation in the antiferromagnetic Dirac material EuMnBi${}_2$ revealed by neutron and resonant x-ray diffraction

Abstract

Field-dependent magnetic structure of a layered Dirac material EuMnBi${}_2$ was investigated in detail by the single crystal neutron diffraction and the resonant x-ray magnetic diffraction techniques. On the basis of the reflection conditions in the antiferromagnetic phase at zero field, the Eu moments were found to be ordered ferromagnetically within the $ab$ plane and stacked antiferromagnetically along the $c$ axis in the sequence of up-up-down-down. Upon the spin-flop transition under the magnetic field parallel to the $c$ axis, the Eu moments are reoriented from the $c$ to the $a$ or $b$ directions forming two kinds of spin-flop domains, whereas the antiferromagnetic structure of the Mn sublattice remains intact as revealed by the quantitative analysis of the change in the neutron diffraction intensities. The present study provides a concrete basis to discuss the dominant role of the Eu sublattice on the enhanced two-dimensionality of the Dirac fermion transport in EuMnBi${}_2$.

arXiv comment16 pages, 5 figures, accepted in PRB

References in corpus (22)

• Electronic Structure of Pyrochlore Iridates: From Topological Dirac Metal to Mott Insulator
• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• Giant anomalous Hall effect in a ferromagnetic Kagome-lattice semimetal
• Correlated quantum phenomena in the strong spin-orbit regime
• Magnetic Weyl Semimetal Phase in a Kagome Crystal
• Fermi-arc diversity on surface terminations of the magnetic Weyl semimetal Co3Sn2S2
• Large intrinsic anomalous Hall effect in half-metallic ferromagnet Co3Sn2S2 with magnetic Weyl fermions
• Evidence for Magnetic Weyl Fermions in a Correlated Metal
• Giant anomalous Nernst effect and quantum-critical scaling in a ferromagnetic semimetal
• The chiral anomaly and thermopower of Weyl fermions in the half-Heusler GdPtBi
• Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet
• Topological Weyl semimetals in the chiral antiferromagnetic materials Mn3Ge and Mn3Sn
• Anisotropic Dirac fermions in a Bi square net of SrMnBi2
• Quantum Hall effect in a bulk antiferromagnet EuMnBi${}_2$ with magnetically confined two-dimensional Dirac fermions
• Anisotropic Dirac electronic structures of AMnBi${}_2$ (A=Sr, Ca)
• Effect of Eu magnetism on the electronic properties of the candidate Dirac material EuMnBi2
• All-in all-out magnetic order and propagating spin-waves in Sm2Ir2O7
• Coupling of magnetic order to planar Bi electrons in the anisotropic Dirac metals AMnBi2 (A = Sr, Ca)
• Direct Evidence for the 'All-in/All-out' Magnetic Structure in the Pyrochlore Iridates from $\mu$SR
• Direct determination of the spin structure of Nd${}_2$Ir${}_2$O${}_7$ by means of neutron diffraction
• Impact of antiferromagnetic order on Landau level splitting of quasi-two-dimensional Dirac fermions in EuMnBi${}_2$

Cited by in corpus (7)

• Nonlinear spin Hall effect in $\mathcal{P}\mathcal{T}$-symmetric collinear magnets
• Magnetic structures, spin-flop transition and coupling of Eu and Mn magnetism in the Dirac semimetal EuMnBi${}_2$
• Tunable spin-valley coupling in layered polar Dirac metals
• Canted Antiferromagnetic phases in the layered candidate Weyl material EuMnSb${}_2$
• Enhancing thermopower and Nernst signal of high-mobility Dirac carriers by Fermi level tuning in the layered magnet EuMnBi${}_2$
• Field-tunable Weyl points and large anomalous Hall effects in degenerate magnetic semiconductor EuMg${}_2$Bi${}_2$
• High-field Studies on Layered Magnetic and Polar Dirac Metals