Magnetic structure of the topological semimetal 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>YbMnSb</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>

Soh, Jian-Rui; Tobin, Siobhan M.; Su, Hao; Živković, Ivica; Ouladdiaf, B.; Stunault, A.; Rodríguez-Velamazán, J. A.; Beauvois, K.; Guo, Yanfeng; Boothroyd, A. T.

doi:10.1103/physrevb.104.l161103

Cited by 15 publications

(11 citation statements)

References 36 publications

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“…Figure 1 (a),(b) present inelastic neutron scattering spectra for YbMnSb 2 in the antiferromagnetic (AFM) phase at T = 5.5(5) K, which reveal the spin wave dispersion along the [H, 0, 0] symmetry direction. The well-defined spin waves are consistent with the localmoment description and emerge above the AFM wave vector Q AFM = (±1, 0, 0), as expected for a Néel-type magnetic order in YbMnSb 2 [30]. Figure 1(a) shows high-resolution data, which clearly demonstrate the presence of a spin-gap, ∆ ≈ 7 meV, resulting from the uniaxial anisotropy.…”

supporting

confidence: 75%

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Coupling of magnetism and Dirac fermions in YbMnSb2

Hu¹,

Sapkota²,

Hu³

et al. 2023

Preprint

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We report inelastic neutron scattering measurements of magnetic excitations in YbMnSb2, a low-carrierdensity Dirac semimetal in which the antiferromagnetic Mn layers are interleaved with Sb layers that host Dirac fermions. We observe a measurable broadening of spin waves, which is consistent with substantial spin-fermion coupling. The spin wave damping, γ, in YbMnSb2 is roughly twice larger compared to that in a sister material, YbMnBi2, where an indication of a small damping consistent with theoretical analysis of the spin-fermion coupling was reported. The inter-plane interaction between the Mn layers in YbMnSb2 is also much stronger, suggesting that the interaction mechanism is rooted in the same spin-fermion coupling. Our results establish the systematics of spin-fermion interactions in layered magnetic Dirac materials.

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supporting

confidence: 75%

“…Single crystals of YbMnSb 2 were grown from Sb flux using the method described in [24]. YbMnSb 2 orders antiferromagnetically below T N ≈ 345 K, with an ordered moment of 3.48µ B at 2 K [30]. INS measurements were performed at the SEQUOIA spectrometer at the Spallation Neutron Source, Oak Ridge National Laboratory.…”

mentioning

confidence: 99%

Coupling of magnetism and Dirac fermions in YbMnSb2

Hu¹,

Sapkota²,

Hu³

et al. 2023

Preprint

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“…Figure 5 shows the temperature dependence of B hf derived from the two models. The larger black circles show B hf derived from the simple one-site full Hamiltonian model showing relatively conventional behaviour (other than the line broadening) up to T = 20 K that can be fitted to the expected J = 7 2 Brillouin function for Eu 2+ yielding an extrapolated magnetic transition temperature of 22.8(1) K. The average hyperfine field derived from the modulated fits (smaller cyan squares) tracks B hf very well, showing that the two models are consistent. The moment modulation develops between 10 K and 12.5 K and Bk 0 (shown as the blue squares) falls away from B hf quite rapidly.…”

Section: Eu Mössbauer Spectroscopymentioning

confidence: 99%

“…The emergence of certain magnetic order or application of a strong enough magnetic field H can lift the spin degeneracy of the bulk Dirac cones in a semimetal [7]. This creates two Weyl nodes for each Dirac node and the associated relativistic Weyl fermions.…”

Section: Introductionmentioning

confidence: 99%

Canted Antiferromagnetic phases in the layered candidate Weyl material EuMnSb$_2$

Wilde,

Riberolles,

Das

et al. 2022

Preprint

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“…The proposed R3̅ m 120°order was not confirmed by the spherical neutron polarimetry analysis, and another type of R3̅ m′ 120°order may be likely. 35 The two separated FM and AFM phases in T A < T < T C are puzzling since they belong to two different irreducible representations 32 and are not allowed by a simple rhombohedral structure with only one Co site from the perspective of the symmetry analysis. Furthermore, a spin glass state 33 starts to appear at T C and becomes stiffer below T A .…”

Section: ■ Introductionmentioning

confidence: 99%

Hidden Local Symmetry Breaking in a Kagome-Lattice Magnetic Weyl Semimetal

Zhang

Matsuda

et al. 2022

J. Am. Chem. Soc.

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Exploring the relationship between intriguing physical properties and structural complexity is a central topic in studying modern functional materials. Co3Sn2S2, a newly discovered kagome-lattice magnetic Weyl semimetal, has triggered intense interest owing to the intimate coupling between topological semimetallic states and peculiar magnetic properties. However, the origins of the magnetic phase separation and spin glass state below T C in this ordered compound are two unresolved yet important puzzles in understanding its magnetism. Here, we report the discovery of local symmetry breaking surprisingly co-emerges with the onset of ferromagnetic order in Co3Sn2S2, by a combined use of neutron total scattering and half-polarized neutron diffraction. An anisotropic distortion of the cobalt kagome lattice at the atomic/nano level is also found, with distinct distortion directions among the two Co1 and four Co2 atoms. The mismatch of local and average symmetries occurs below T C, indicating that Co3Sn2S2 evolves to an intrinsically lattice disordered system when the ferromagnetic order is established. The local symmetry breaking with intrinsic lattice disorder provides new understanding of the puzzling magnetic properties. Our density functional theory (DFT) calculation indicates that the local symmetry breaking is expected to reorient local ferromagnetic moments, unveiling the existence of the ferromagnetic instability associated with the lattice instability. Furthermore, DFT calculation unveils that the local symmetry breaking could affect the Weyl property by breaking the mirror plane. Our findings highlight the fundamentally important role that the local symmetry breaking plays in advancing our understanding on the magnetic and topological properties in Co3Sn2S2, which may draw attention to explore the overlooked local symmetry breaking in Co3Sn2S2, its derivatives and more broadly in other topological Dirac/Weyl semimetals and kagome-lattice magnets.

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Magnetic structure of the topological semimetal YbMnSb2

Cited by 15 publications

References 36 publications

Coupling of magnetism and Dirac fermions in YbMnSb2

Coupling of magnetism and Dirac fermions in YbMnSb2

Canted Antiferromagnetic phases in the layered candidate Weyl material EuMnSb$_2$

Hidden Local Symmetry Breaking in a Kagome-Lattice Magnetic Weyl Semimetal

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