Berlin 2024 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 65: Frustrated Magnets: General I

TT 65.5: Talk

Thursday, March 21, 2024, 10:30–10:45, H 2053

Spin-lattice coupling in Mn₃Ge and Mn₃Sn — •Aleksandr Sukhanov¹, Artem Korshunov², Nikita Andriushin¹, Alexei Bosak², and Marein Rahn¹ — ¹Institut für Festkörper- und Materialphysik, Technische Universität Dresden, D-01069 Dresden — ²European Synchrotron Radiation Facility (ESRF), BP 220, F-38043 Grenoble Cedex, France

Strong spin-lattice coupling in a material can be evidenced in spectroscopy by hybridization of magnons and phonons, which are quanta of spin excitations and crystal-lattice vibrations in ordered materials, respectively. In this case, an avoided crossing can be formed when the bare magnon and phonon dispersions intersect in reciprocal space at some momentum and energy.

The isostructural hexagonal compounds Mn₃Ge and Mn₃Sn are both characterized by a noncollinear spin order due to the geometric frustration of the kagome lattice formed by Mn ions. In this talk, we will discuss the results of our recent single-crystal inelastic x-ray scattering experiments on these two compounds. We were able to clearly resolve momenta and energy of the spin-lattice hybrid excitations in Mn₃Ge, whereas Mn₃Sn seem to show no signs of spin-lattice coupling in its spectra.

Keywords: magnons; phonons; inelastic x-ray scattering