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We report the synthesis, characterization, low-temperature magnetic, andthermodynamic measurements of the novel milli-Kelvin adiabatic demagnetizationrefrigeration (mK-ADR) candidate material NaYbGeO$_4$ which exhibits adistorted square lattice arrangement of YbO$_{6}$ magnetic units. Magnetizationand specific heat indicate weakly interacting effective spin-1/2 moments below10~K, with a Curie-Weiss temperature of only 15~mK, that can be polarized bymagnetic fields of order 1~T. For the ADR performance test, we start thedemagnetization from 5~T at a temperature of $\sim 2$~K and reach a minimumtemperature of 150~mK at zero field. The warming curve indicates a sharpmagnetic transition in the heat capacity at 210~mK, implying only weak magneticfrustration. The entropy density of $S_{\rm GS}\simeq 101$ mJ K$^{-1}$cm$^{-3}$ and hold time below 2~K of 220~min are competitive while theminimal temperature is higher compared to frustrated Ytterbium-oxide ADRmaterials studied under similar conditions.

Adiabatic demagnetization refrigeration to mK temperatures with the distorted square lattice magnet NaYbGeO$_{4}$