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The LUMINEU project aims at performing a demonstrator underground experimentsearching for the neutrinoless double beta decay of the isotope $^{100}$Moembedded in zinc molybdate (ZnMoO$_4$) scintillating bolometers. In thiscontext, a zinc molybdate crystal boule enriched in $^{100}$Mo to 99.5\% with amass of 171 g was grown for the first time by the low-thermal-gradientCzochralski technique. The production cycle provided a high yield (the crystalboule mass was 84\% of initial charge) and an acceptable level -- around 4\% --of irrecoverable losses of the costy enriched material. Two crystals of 59 gand 63 g, obtained from the enriched boule, were tested aboveground atmilli-Kelvin temperature as scintillating bolometers. They showed a highdetection performance, equivalent to that of previously developed naturalZnMoO$_4$ detectors. These results pave the way to future sensitive searchesbased on the LUMINEU technology, capable to approach and explore the invertedhierarchy region of the neutrino mass pattern.

Enriched Zn$^{100}$MoO$_4$ scintillating bolometers to search for $0 \nu 2\beta$ decay of $^{100}$Mo with the LUMINEU experiment