We report on the development of scintillating bolometers based on lithium molybdate crystals that contain molybdenum that has depleted into the double-$\beta$ active isotope ${}^{100}$Mo (Li${}_2$${}^{100\mathrm{depl}}$MoO${}_4$). We used two Li${}_2$${}^{100\mathrm{depl}}$MoO${}_4$ cubic samples, each of which consisted of 45-millimeter sides and had a mass of 0.28 kg; these samples were produced following the purification and crystallization protocols developed for double-$\beta$ search experiments with ${}^{100}$Mo-enriched Li${}_2$MoO${}_4$ crystals. Bolometric Ge detectors were utilized to register the scintillation photons that were emitted by the Li${}_2$${}^{100\mathrm{depl}}$MoO${}_4$ crystal scintillators. The measurements were performed in the CROSS cryogenic set-up at the Canfranc Underground Laboratory (Spain). We observed that the Li${}_2$${}^{100\mathrm{depl}}$MoO${}_4$ scintillating bolometers were characterized by an excellent spectrometric performance (∼3–6 keV of FWHM at 0.24–2.6 MeV $\gamma$s), moderate scintillation signal (∼0.3–0.6 keV/MeV scintillation-to-heat energy ratio, depending on the light collection conditions), and high radiopurity (${}^{228}$Th and ${}^{226}$Ra activities are below a few µBq/kg), which is comparable with the best reported results of low-temperature detectors that are based on Li${}_2$MoO${}_4$ using natural or ${}^{100}$Mo-enriched molybdenum content. The prospects of Li${}_2$${}^{100\mathrm{depl}}$MoO${}_4$ bolometers for use in rare-event search experiments are briefly discussed.

CUPID-0 is the first large array of scintillating Zn ${}^{82}$ Se cryogenic calorimeters (bolometers) implementing particle identification for the search of the neutrinoless double beta decay (0 $\nu \beta \beta$ ). The detector consists of 24 enriched Zn ${}^{82}$ Se bolometers for a total ${}^{82}$ Se mass of 5.28 kg and it has been taking data in the underground LNGS (Italy) since March 2017. In this article we show how the dual read-out provides a powerful tool for the $\alpha$ particles rejection. The simultaneous use of the heat and light information allows us to reduce the background down to (3.2 ${}_{-1.1}^{+1.3}$ )×10 ${}^{-3}$ counts/(keV kg year), an unprecedented level for cryogenic calorimeters. In a total exposure of 5.46 kg year Zn ${}^{82}$ Se we set the most stringent limit on the 0 $\nu \beta \beta$ decay ${}^{82}$ Se half-life $T_{1/2}^{0\nu }>4.0\times {10}^{24}$ year at 90% C.I.