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Title: Coupling of magnetism and Dirac fermions in YbMnSb 2

Journal Article · · Physical Review. B
ORCiD logo [1];  [2];  [3]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [1];  [3]; ORCiD logo [1]
  1. Brookhaven National Laboratory (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
  2. 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)
  3. Brookhaven National Laboratory (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Stony Brook Univ., NY (United States)
  4. 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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES)
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; TRN: US2400020
Journal Information:
Physical Review. B, Vol. 107, Issue 20; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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