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The NMR spectrum of FeSe shows a dramatic broadening on cooling towards thebulk nematic phase at $T_s=90$ K, due to the formation of a quasi-static,short-range-ordered nematic domain structure. However, a quantitativeunderstanding of the NMR broadening and its relationship to the nematicsusceptibility is still lacking. Here, we show that the temperature andpressure dependence of the broadening is in quantitative agreement with themean-field Edwards-Anderson parameter of an Ising-nematic model in the presenceof random-field disorder introduced by non-magnetic impurities. Furthermore,these results reconcile the interpretation of NMR and Raman spectroscopy datain FeSe under pressure.

Edwards-Anderson parameter and local Ising-nematicity in FeSe revealed via NMR spectral broadening