Ferrimagnetic excitations in the layered hexagonal compound Mn<sub>3</sub>Si<sub>2</sub>Te<sub>6</sub>
ORAL
Abstract
The layered ferrimagnet Mn3Si2Te6 orders below Tc=78 K. The S=5/2 Mn sites are arranged in alternating honeycomb and triangular lattice layers. Each honeycomb layer is ferromagnetically ordered with the moments pointing in a singular direction in the ab-plane. The triangular lattice layer has the moments also pointing in the ab-plane but in the opposite direction. A net moment is generated due to an imbalance in the Mn content within the different layer types. We examine single crystal inelastic neutron scattering measurements of the excitations in Mn3Si2Te6 below Tc. We use super-resolution image correlation techniques to refine the resolution convolved spin-wave spectrum in order to determine the exchange interactions in this system. We find significant exchange interactions orthogonal to the ab-plane, produce a network of geometrically frustrated interactions. The potential for Dirac nodes in the dispersion of the coupled ferromagnetic hexagonal layers will also be considered.
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This research was supported by the U.S. DOE, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.
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Presenters
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Matthew Stone
- Oak Ridge National Lab
- Neutron Scattering Division, Oak Ridge National Laboratory
- Quantum Condensed Matter Div, Oak Ridge National Lab
- Oak Ridge National Laboratory
- Spallation Neutron Source, Oak Ridge National Laboratory
- Neutron Scattering Division, Oak Ridge National Lab
- Neutron Scattering Division, OakRidge National Laboratory