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Recent ultrafast photoemission experiments showed signatures of an ultrafastmodification of the electronic band structure in FeRh indicative of aferromagnetic (FM) state that is initiated by a non-equilibrium occupation ofthe electronic states upon femtosecond laser excitation. We use ultrafast x-raydiffraction to examine the impact of hot electrons on the antiferromagnetic(AFM) to FM phase transition. By increasing the pump-pulse duration up to$10.5\,\text{ps}$, we eliminate hot electrons and see that the nucleation of FMdomains still proceeds at the intrinsic timescale of $8\,\text{ps}$, whichstarts when the deposited energy surpasses the threshold energy. For longpulses, the phase transition proceeds considerably faster than predicted by aconvolution of the dynamics observed for ultrafast excitation with the longpump pulse duration. We predict that quite generally, slow photoexcitation canresult in a fast response, if the non-linear threshold behavior of afirst-order phase transition is involved.

Picosecond pump pulses probe the relevance of hot electrons for the laser-induced phase transition in FeRh