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Strong interplay of spin and charge/orbital degrees of freedom is thefundamental characteristic of the iron-based superconductors (FeSCs), whichleads to the emergence of a nematic state as a rule in the vicinity of theantiferromagnetic state. Despite intense debate for many years, however,whether nematicity is driven by spin or orbital fluctuations remains unsettled.Here, by use of transport, magnetization, and $^{75}$As nuclear magneticresonance (NMR) measurements, we show a striking transformation of therelationship between nematicity and spin fluctuations (SFs) inNa$_{1-x}$Li$_x$FeAs; For $x\leq 0.02$, the nematic transition promotes SFs. Incontrast, for $x\geq 0.03$, the system undergoes a non-magnetic phasetransition at a temperature $T_0$ into a distinct nematic state that suppressesSFs. Such a drastic change of the spin fluctuation spectrum associated withnematicity by small doping is highly unusual, and provides insights into theorigin and nature of nematicity in FeSCs.

Tuning the interplay between nematicity and spin fluctuations in Na$_{1-x}$Li$_x$FeAs superconductors