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arXiv · 2410.20948

Magnon-phonon interactions in the spinel compound MnSc$_2$Se$_4$

J. Sourd·Y. Skourski·L. Prodan·V. Tsurkan·A. Miyata·J. Wosnitza·S. Zherlitsyn
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Abstract

We investigated the magnetic and magnetoelastic properties of MnSc$_2$Se$_4$ single crystals at low temperature under a magnetic field directed along the crystallographic [111] axis. The magnetization data at low temperature show a linear increase with magnetic field, until saturation is reached above 15 T. In ultrasound, a longitudinal acoustic mode shows a softening in field, which is absent for a transverse acoustic mode. We discuss these results using a microscopic model based on the framework of linear spin-wave theory. The magnetic and magnetoelastic data are qualitatively reproduced by considering magnon-phonon interactions arising from exchange-striction coupling between the crystal lattice and spin-wave fluctuations in the zero-temperature limit.

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J. Sourd, Y. Skourski, L. Prodan, V. Tsurkan, A. Miyata, J. Wosnitza, S. Zherlitsyn. 2024-10-28. Magnon-phonon interactions in the spinel compound MnSc$_2$Se$_4$. https://doi.org/10.1103/physrevb.110.094414

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