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We investigate THz conductivity dynamics in NdNiO$_3$ and EuNiO$_3$ thinfilms following a photoinduced thermal quench into the metallic state andreveal a clear contrast between first- and second-order dynamics. While inEuNiO$_3$ the conductivity recovers exponentially, in NdNiO$_3$ the recovery isnon-exponential and slower than a simple thermal model. Crucially, it isconsistent with first-order dynamics and well-described by a 2d Avrami model,with supercooling leading to metastable phase coexistence. The large transientsseen in our films are promising for fast electronic (and magnetic) switchingapplications.

Nucleation and growth bottleneck in the conductivity recovery dynamics of nickelate thin films