SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 23: Kagome Systems
TT 23.12: Vortrag
Dienstag, 28. März 2023, 12:30–12:45, HSZ 304
Magnon-phonon coupling in the Kagome-lattice antiferromagnet Mn3Ge — •Aleksandr Sukhanov, Nikita Andriushin, Anton Kulbakov, and Dmytro Inosov — Institut für Festkörper- und Materialphysik, Technische Universität Dresden, D-01069 Dresden
Magnons and phonons, which are quanta of spin excitations and crystal-lattice vibrations in ordered materials, respectively, can be strongly coupled together when their dispersion relations intersect in reciprocal space. This results in hybridised collective spin-lattice excitations, also known as magnetoelastic (ME) modes.
The metallic hexagonal compound Mn3Ge is characterized by a noncollinear spin order due to the geometric frustration of the Kagome lattice formed by Mn ions. Our earlier studies showed that Mn3Ge belongs to a rare class of materials that possess very strong ME coupling. The ME effect is manifested in the large negative thermal expansion of the material and high-pressure tuning of its remarkable anomalous Hall effect. Most intriguing is a previous observation that the noncollinear spin structure of Mn3Ge can be driven into a collinear ferromagnetic state under a hydrostatic pressure of ∼5 GPa. This, in turn, provides hints on how the magnetic structure is linked to the unconventional electron transport phenomena in this material.
In this talk, we will discuss the results of our recent single-crystal inelastic neutron and x-ray scattering spectroscopy measurements of Mn3Ge. We were able to clearly resolve momenta and energy of the ME hybridization. The experimental results are supported with the first-principle lattice dynamics calculations.