Coupling of magnetism and Dirac fermions in YbMnSb2

Xiao Hu; Aashish Sapkota; Zhixiang Hu; Andrei T. Savici; Alexander I. Kolesnikov; John M. Tranquada; Cedomir Petrovic; Igor A. Zaliznyak

doi:10.1103/PhysRevB.107.L201117

Coupling of magnetism and Dirac fermions in YbMnSb2

Xiao Hu, Aashish Sapkota, Zhixiang Hu, Andrei T. Savici, Alexander I. Kolesnikov, John M. Tranquada, Cedomir Petrovic, Igor A. Zaliznyak

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Abstract

We report inelastic neutron scattering measurements of magnetic excitations in YbMnSb2, a low-carrier-density 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 a theoretical analysis of the spin-fermion coupling was reported. The interplane 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.

Original language	English
Article number	L201117
Journal	Physical Review B
Volume	107
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevB.107.L201117
State	Published - May 15 2023

Funding

Acknowledgments. We gratefully acknowledge discussions with A. Tsvelik and technical assistance from V. Fanelli. This work at Brookhaven National Laboratory was supported by Office of Basic Energy Sciences (BES), Division of Materials Sciences and Engineering, U.S. Department of Energy (DOE), under Contract No. DE-SC0012704. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

Funders	Funder number
U.S. Department of Energy	DE-SC0012704
Basic Energy Sciences
Division of Materials Sciences and Engineering

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abstract = "We report inelastic neutron scattering measurements of magnetic excitations in YbMnSb2, a low-carrier-density 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 a theoretical analysis of the spin-fermion coupling was reported. The interplane 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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AU - Hu, Xiao

AU - Sapkota, Aashish

AU - Hu, Zhixiang

AU - Savici, Andrei T.

AU - Kolesnikov, Alexander I.

AU - Tranquada, John M.

AU - Petrovic, Cedomir

AU - Zaliznyak, Igor A.

PY - 2023/5/15

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AB - We report inelastic neutron scattering measurements of magnetic excitations in YbMnSb2, a low-carrier-density 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 a theoretical analysis of the spin-fermion coupling was reported. The interplane 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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Coupling of magnetism and Dirac fermions in YbMnSb2

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