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Attaining milli-Kelvin temperatures is often a prerequisite for the study ofnovel quantum phenomena and the operation of quantum devices. Adiabaticdemagnetization refrigeration (ADR) is an effective, easy and sustainablealternative to evaporation or dilution cooling with the rare andsuper-expensive $^3$He. Paramagnetic salts, traditionally used for mK-ADR,suffer from chemical instability related to water of crystallization. We reportsynthesis, characterization as well as low-temperature magnetization andspecific heat measurements of two new UHV compatible candidate materialsNaYbP$_2$O$_7$ and KYbP$_2$O$_7$. Utilizing the PPMS at 2 K, the ADR ofsintered pellets with Ag powder admixture starting at 5 T yields basetemperatures (warm-up times) of 45 mK (55 min) and 37 mK (35 min) forNaYbP$_2$O$_7$ and KYbP$_2$O$_7$, respectively, slightly advantageous toKBaYb(BO$_3$)$_2$ (45 mK and 40 min) studied under similar conditions.

Efficient adiabatic demagnetization refrigeration to below 50 mK with UHV compatible Ytterbium diphosphates $A$YbP$_2$O$_7$ ($A=$Na, K)