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This paper reports on the development of a technology involving$^{100}$Mo-enriched scintillating bolometers, compatible with the goals ofCUPID, a proposed next-generation bolometric experiment to search forneutrinoless double-beta decay. Large mass ($\sim$1~kg), high optical quality,radiopure $^{100}$Mo-containing zinc and lithium molybdate crystals have beenproduced and used to develop high performance single detector modules based on0.2--0.4~kg scintillating bolometers. In particular, the energy resolution ofthe lithium molybdate detectors near the $Q$-value of the double-betatransition of $^{100}$Mo (3034~keV) is 4--6~keV FWHM. The rejection of the$\alpha$-induced dominant background above 2.6~MeV is better than 8$\sigma$.Less than 10~$\mu$Bq/kg activity of $^{232}$Th ($^{228}$Th) and $^{226}$Ra inthe crystals is ensured by boule recrystallization. The potential of$^{100}$Mo-enriched scintillating bolometers to perform high sensitivitydouble-beta decay searches has been demonstrated with only 10~kg$\times$dexposure: the two neutrino double-beta decay half-life of $^{100}$Mo has beenmeasured with the up-to-date highest accuracy as $T_{1/2}$ = [6.90 $\pm$0.15(stat.) $\pm$ 0.37(syst.)] $\times$ 10$^{18}$~yr. Both crystallization anddetector technologies favor lithium molybdate, which has been selected for theongoing construction of the CUPID-0/Mo demonstrator, containing several kg of$^{100}$Mo.

Development of $^{100}$Mo-containing scintillating bolometers for a high-sensitivity neutrinoless double-beta decay search