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Long-range entanglement in quantum spin liquids (QSLs) lead to novel lowenergy excitations with fractionalised quantum numbers and (in 2D) statistics.Experimental detection and manipulation of these excitations present achallenge particularly in view of diverse candidate magnets. A promising probeof fractionalisation is their coupling to phonons. Here we present Ramanscattering results for the S = 1/2 honeycomb iridate Cu2IrO3, a candidateKitaev QSL with fractionalised Majorana fermions and Ising flux excitations. Weobserve anomalous low temperature frequency shift and linewidth broadening ofthe Raman intensities in addition to a broad magnetic continuum both of which,we derive, are naturally attributed to the phonon decaying into itinerantMajoranas. The dynamic Raman susceptibility marks a crossover from the QSL to athermal paramagnet at ~120 K. The phonon anomalies below this temperaturedemonstrate a strong phonon-Majorana coupling. These results provide forevidence of spin fractionalisation in Cu2IrO3.

Probing signatures of fractionalization in candidate quantum spin liquid Cu2IrO3 via anomalous Raman scattering