Coupling of magnetism and Dirac fermions in YbMnSb2

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

doi:10.1103/physrevb.107.l201117

Coupling of magnetism and Dirac fermions in YbMnSb2

Journal Article · Fri May 26 00:00:00 EDT 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.107.l201117· OSTI ID:1976000

^[1]; Sapkota, Aashish ^[2]; Hu, Zhixiang ^[3]; ^[4]; ^[4]; ^[1]; Petrovic, Cedomir ^[3]; ^[1]

Brookhaven National Laboratory (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Brookhaven National Laboratory (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Ames Lab., and Iowa State Univ., Ames, IA (United States)
Brookhaven National Laboratory (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Stony Brook Univ., NY (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division

Here, 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.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC05-00OR22725; SC0012704

OSTI ID:: 1976000

Alternate ID(s):: OSTI ID: 1975430
OSTI ID: 1983765

Report Number(s):: BNL-224445-2023-JAAM

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 20 Vol. 107; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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