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The interplay between the nematic order and magnetism in FeSe is not yet wellunderstood. There is a controversy concerning the relationship between orbitaland spin degrees of freedom in FeSe and their relevance for superconductivity.Here we investigate the effect of S substitution on the nematic transitiontemperature ($T_{\rm n}$) and the low-energy spin fluctuations (SF) in FeSesingle crystals. We show that the low-energy SF emerge below the nematictransition. The difference between the onset temperature for the critical SF($T_{\rm SF}$) and $T_{\rm n}$ is small for FeSe but significantly increaseswith S substitution. Below $T_{\rm SF}$ the Korringa relation is violated andthe effective muon hyperfine coupling constant changes a sign. Our resultsexclude a direct coupling of the low-energy SF to the electronic nematic orderindicating a presence of multiple spin degrees of freedom in FeSe$_{\rm1-x}$S$_{\rm x}$.

Anomalous Knight shift and low-energy spin dynamics in the nematic state of FeSe$_{\rm 1-x}$S$_{\rm x}$