We study quantized vortices in dipolar supersolids at the transition between the superfluid and the supersolid phase. We present an approach to the nucleation of vortices and their observation, based on the quenching of the $s$-wave scattering length across the phase transition. Starting from a slowly rotating, vortex-free configuration in the superfluid phase, we predict vortex nucleation as the system enters the supersolid phase, due to the strong reduction of the critical angular velocity in the supersolid. Once a vortex is created, we show that it is robustly preserved when the condensate is brought back to the superfluid phase, where it may be readily observed. These results may have a significant impact on ongoing experiments, given that the observation of quantized vortices would constitute a key probe of the superfluid character of dipolar supersolids.

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• Bose-Einstein condensates
• Dipolar gases
• Phase transitions
• Superfluidity
• Vortices in superfluids
• Superfluids
• Supersolids