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Figure 3
(a) Longitudinal elastic scan around (110), where S refers to the dynamical structure factor. (b) Transvere elastic scan around (110). (c), (d) Inelastic scans showing the temperature-dependent evolution of the magnon modes starting from the skyrmion phase at T = 28.3 K up to the nonmagnetic phase. The scans in panels (c) and (d) correspond to respective positions (i) and (ii) marked in Fig. 2[link]. The complicated magnon structure in the skyrmion phase is lost when increasing the temperature. The solid lines for the skyrmion phase at Tskx = 28.3 K are resolution-convolution simulations of the magnon model (Garst et al., 2017View full citation; Weber et al., 2022View full citation); all the other solid lines are Lorentzian fits. The label s1 marks the position where the first excitation of the skyrmion lattice is expected. (e), (f) The non-reciprocity that is characteristic of the ordered magnetic phases is retained throughout the paramagnetic phase and only disappears in the clearly non-magnetic regime for T > 80 K. It manifests itself via a time-reversal asymmetry that is evident when flipping the polarity of the magnetic field. Panel (e) shows the paramagnons for T = 30.4 K. Here, the solid lines are Lorentzian fits. In panel (f) the asymmetric energy maxima are plotted against temperature.

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