Spin excitations in the magnetically ordered phases of MnSc$_2$S$_4$

B. Tóth; K. Amelin; T. Rõõm; U. Nagel; V. Tsurkan; L. Prodan; I. Kézsmárki; S. Bordács

Spin excitations in the magnetically ordered phases of MnSc$_2$S$_4$

Strongly Correlated Electrons 2022-06-30 v1

Authors: B. Tóth , K. Amelin , T. Rõõm , U. Nagel , V. Tsurkan , L. Prodan , I. Kézsmárki , S. Bordács

Abstract

Recent neutron scattering experiments suggested that frustrated magnetic interactions give rise to antiferromagnetic spiral and fractional skyrmion lattice phases in MnSc $_2$ S $_4$ . Here, to trace the signatures of these modulated phases, we studied the spin excitations of MnSc $_2$ S $_4$ by THz spectroscopy at 300 mK up to 12 T. We found a single magnetic resonance with linearly increasing frequency in field. The corresponding $g$ -factor of Mn $^{2+}$ ions $g$ = 1.96, and the absence of other resonances imply very weak anisotropies and negligible contribution of higher harmonics to the spiral state. The significant difference between the dc magnetic susceptibility and the lowest-frequency ac susceptibility in our experiment implies the existence of mode(s) below 100 GHz.

Keywords

spin excitations mnsc2s4 frustrated magnetism skyrmion lattice thz spectroscopy antiferromagnetic spiral

Cite

@article{arxiv.2206.14455,
  title  = {Spin excitations in the magnetically ordered phases of MnSc$_2$S$_4$},
  author = {B. Tóth and K. Amelin and T. Rõõm and U. Nagel and V. Tsurkan and L. Prodan and I. Kézsmárki and S. Bordács},
  journal= {arXiv preprint arXiv:2206.14455},
  year   = {2022}
}

Spin excitations in the magnetically ordered phases of MnSc$_2$S$_4$

Abstract

Keywords

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