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In the present work, two successive magneto-structural transformations (MSTs)consisting of martensitic and intermartensitic transitions have been reportedin polycrystalline Ni55.8Mn18.1Ga26.1 Heusler alloy. Benefiting from theadditional latent heat contributed from intermediate phase, this alloy exhibitsa large transition entropy change {\Delta}Str with the value of ~28 J/kg K.Moreover, the magnetocaloric effect (MCE) has been also evaluated in terms ofMaxwell relation. For the magnetic field change of 3 T, it is found that thecalculated value of refrigeration capacity for Ni55.8Mn18.1Ga26.1 attains to~72 J/kg around room temperature, which significantly surpasses those obtainedin many Ni-Mn based Heusler alloys. The mechanism underlying the enhanced MCEis believed to be responsible for these multiple transformations, which cansustain the pronounced isothermal entropy change {\Delta}ST over a relativelywide temperature interval.

Two successive magneto-structural transformations and their relation to enhanced magnetocaloric effect for Ni55.3Mn19.7Ga25 Heusler alloy