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TT: Fachverband Tiefe Temperaturen

TT 65: Frustrated Magnets: General I

TT 65.9: Vortrag

Donnerstag, 21. März 2024, 11:45–12:00, H 2053

Magnon-phonon hybridization in the canted antiferromagnet MnSc₂Se₄ — •Jeremy Sourd¹, L Prodan², V Tsurkan², J Grumbach³, M Dörr³, A Miyata⁴, T Gottschall¹, J Wosnitza^1,3, and S Zherlitsyn¹ — ¹Dresden High Magnetic Field Laboratory (HLD-EMFL), HZDR, Germany — ²Institute for Experimental Physics, University of Augsburg, Germany — ³Institute of Solid State and Materials Physics, TU Dresden, Germany — ⁴Institute of Solid State Physics, University of Tokyo, Japan

The antiferromagnetic spinel compounds MnSc₂X₄ (X = S, Se) show extraordinary properties with various field induced phases due to their relatively small ordering temperature T_N < 2.5 K and saturation field µ₀ H_c < 15 T. Thanks to the exchange-striction coupling between the localized S = 5/2 Mn²⁺ ions and the crystal lattice, ultrasound experiments permit to explore the H−T phase diagram of this system in detail. Whereas MnSc₂S₄ shows a very rich phase diagram with a skyrmion phase induced by magnetic field, no transition is observed in MnSc₂Se₄ between the zero-field antiferromagnetic phase and the fully polarized state. Furthermore, our ultrasound data on MnSc₂Se₄ are qualitatively reproduced by a magnon-phonon hybridization term arising from exchange-striction coupling between the crystal lattice and canted spin-wave fluctuations.

Keywords: ultrasound; canted antiferromagnet; spin waves