“…Lanthanide-based metal–organic frameworks (Ln MOFs) have attracted considerable attention in the last two decades because of their potential technological applications in cryogenic magnetic refrigeration (CMR). 1 Nowadays, the attention in this field is moving toward magnetically anisotropic holmium( iii )-based MOFs, 2 because they exhibit magnetocaloric effects (MCE) at higher temperatures than their largely investigated magnetically isotropic gadolinium( iii ) counterparts. 3,4 In this respect, metallic holmium itself and the related intermetallic alloys HoB 2 , HoAl 2 and Ho(Co,Ni,Fe) 2 are proposed as efficient cryomagnetic coolers operating between the strategically relevant hydrogen and nitrogen liquefaction temperatures, 5–8 in place of traditional oxides, such as gadolinium( iii )–gallium( iii ) garnet (GGG) and its dysprosium( iii )-substituted derivatives of general formula (Dy x Gd 1− x ) 3 Ga 5 O 12 [ x = 0 (GGG), 0.5 (DGGG), and 1 (DGG)], working between the helium and hydrogen liquefaction temperatures.…”