Magnon spectrum in a candidate Weyl semi-metal with magnetic order
We propose to investigate the magnon spectrum in the antiferromagnetic phase of YbMnBi2. This material has recently been identified as a candidate Weyl semi-metal driven by time-reversal symmetry breaking. Magnetic order is therefore key to its behaviour as a topological material, and the magnon spectrum and exchange parameters derived from it could reflect the presence of Weyl fermions near the Fermi energy. We shall use IN8 with the flatcone analysers to map out the magnon dispersion in all high symmetry directions. To identify any anomalies associated with the presence of Weyl fermions we shall compare the observed magnon spectrum with that in CaMnBi2, which we have studied previously on IN8 and which does not host Weyl fermions.
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BOOTHROYD Andrew Timothy; IVANOV Alexandre; Henrik Jacobsen; PIOVANO Andrea and JIAN-RUI SOH. (2018). Magnon spectrum in a candidate Weyl semi-metal with magnetic order. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1572
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