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The effect of Si and Ga substitutions on the magnetic and the magnetocaloricproperties in Heusler based system Ni46Co4Mn38Sb12-xZx (Z=Si and Ga) has beenstudied. From the M(T) plots it is found that Si substitution stabilizes theaustenite phase, whereas, Ga substitution stabilizes the martensite phase.Strong metamagnetic behaviour is observed in the M(H) isotherms for Si=0.75 and1, whereas, such a behaviour is absent in the Ga substituted alloys. Associatedwith magneto-structural transition, large MCE of 58 J/kg K and 70 J/kg K isobserved for x=0.75 and 1, respectively in the case of Si. Though the MCEobserved in x=0.5 and 1 in the case of Ga is much lower, the MCE peak is foundto be quite broad.

Effect of Si and Ga substitutions on the magnetocaloric properties of NiCoMnSb quaternary Heusler alloys