Journal
PHYSICAL REVIEW B
Volume 100, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.100.144431
Keywords
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Funding
- U.K. Engineering and Physical Sciences Research Council [EP/N034872/1, EP/M020517/1]
- Natural Science Foundation of Shanghai [17ZR1443300]
- Shanghai Pujiang Program [17PJ1406200]
- National Key Research and Development Program of China [2017YFA0302901]
- Beijing Natural Science Foundation [Z180008]
- K. C. Wong Education Foundation [GJTD-2018-01]
- Singapore National Science Scholarship, Agency for Science Technology and Research
- EPSRC [EP/N034872/1, EP/M020517/1] Funding Source: UKRI
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We investigated the magnetic structure and dynamics of YbMnBi2, with elastic and inelastic neutron scattering, to shed light on the topological nature of the charge carriers in the antiferromagnetic phase. We confirm C-type antiferromagnetic ordering of the Mn spins below T-N = 290 K and determine that the spins point along the c axis to within about 3 degrees. The observed magnon spectrum can be described very well by the same effective spin Hamiltonian that was used previously to model the magnon spectrum of CaMnBi2. Our results show conclusively that the creation of Weyl nodes in YbMnBi2 by the time-reversal symmetry-breaking mechanism can be excluded in the bulk.
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