Magnetic excitations in the anisotropic Dirac materials AMnBi2 (A = Ca, Sr)
The electronic dispersion of "Dirac" materials such as graphene and topological insulators is linear, resulting in a variety of peculiar electronic properties. In graphene and known topological insulators this linear dispersion is usually isotropic. Recently the materials SrMnBi2 and CaMnBi2 have been determined to host highly anisotropic 2D Dirac fermions in a square conducting layer of Bi. In addition, the structure contains a separate strongly correlated subsystem in MnBi layers, with our previous neutron diffraction measurements demonstrating a checkerboard antiferromagnetic arrangement in the ab-plane with either a ferromagnetic (Ca) or atiferromagnetic (Sr) coupling along the c-axis. We propose to determine the nature and strength of the magnetic couplings in these materials, specifically the interlayer coupling which is expected to be different in the two systems, and to search for evidence of hybridisation between localised Mn spin-wave modes and Dirac fermions on the Bi layers.
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PRINCEP Andrew; BOOTHROYD Andrew Timothy; GUO Yanfeng; PIOVANO Andrea; PRABHAKARAN Dharmalingam and Marein C. Rahn. (2014). Magnetic excitations in the anisotropic Dirac materials AMnBi2 (A = Ca, Sr). Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1366
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