Broadband magnetic resonance spectroscopy in MnSc2S4

Tóth, Boglárka and Amelin, Kirill and Rõõm, Toomas and Nagel, Urmas and Bauernfeind, Anastasia and Tsurkan, Vladimir and Prodan, Lilian and Krug von Nidda, Hans‑Albrecht and Scheffler, Marc and Kézsmárki, István and Bordács, Sándor (2023) Broadband magnetic resonance spectroscopy in MnSc2S4. SCIENTIFIC REPORTS. ISSN 2045-2322

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Abstract

Recent neutron scattering experiments suggested that frustrated magnetic interactions give rise to antiferromagnetic spiral and fractional skyrmion lattice phases in MnSc2S4 . Here, to trace the signatures of these modulated phases, we studied the spin excitations of MnSc2S4 by THz spectroscopy at 300 mK and in magnetic felds up to 12T and by broadband microwave spectroscopy at various temperatures up to 50GHz. We found a single magnetic resonance with frequency linearly increasing in feld. The small deviation of the Mn2+ ion g-factor from 2, g = 1.96, and the absence of other resonances imply very weak anisotropies and negligible contribution of higher harmonics to the spiral state. The signifcant diference between the dc magnetic susceptibility and the lowestfrequency ac susceptibility in our experiment implies the existence of mode(s) outside of the measured frequency windows. The combination of THz and microwave experiments suggests a spin gap opening below the ordering temperature between 50GHz and 100GHz.

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