Barocaloric properties of quaternary Mn3(Zn,In)N for room temperature refrigeration applications

Abstract

The magnetically frustrated manganese nitride antiperovskite family display significant changesof entropy under hydrostatic pressure that can be useful for the emerging field of barocaloric cool-ing. Here we show that barocaloric properties of metallic antiperovskite Mn nitrides can be tai-lored for room temperature application through quaternary alloying.We find an enhanced en-tropy change of ∆St= 37 J K−1kg−1at theTt= 300 K antiferromagnetic transition of quater-nary Mn3Zn0.5In0.5N relative to the ternary end-members.The pressure-driven barocaloric entropychange of Mn3Zn0.5In0.5N reaches ∆SBCE= 20 J K−1kg−1in 2.9 kbar.Our results open up a largephase space where new compounds with improved barocaloric properties may be found.