Abstract
The Mo2FeB2-type compounds RE2Ga2Mg (RE = Tm, Er, Ho) (space group P4/mbm) exhibit a large magnetocaloric (MC) effect which makes them promising for use in cryogenic magnetic cooling applications. They exhibit low temperature metamagnetic nature below their Néel temperatures of 6.8, 11.7 and 18.4 K for Tm2Ga2Mg, Er2Ga2Mg and Ho2Ga2Mg, respectively. The magnetic entropy change, the temperature-averaged entropy change (3 K-lift), and the relative cooling power under a magnetic field change of 0–7 T are 15.6, 15.4 J/kgK and 275.8 J/kg for Tm2Ga2Mg; 13.2, 13.0 J/kgK and 268.0 J/kg for Er2Ga2Mg; as well as 9.1, 9.0 J/kgK and 223.0 J/kg for Ho2Ga2Mg, respectively.
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