Effect of hydrostatic pressure on the Curie temperature of the Heusler alloys Ni2MnZ(Z = Al, Ga, In, Sn and Sb)

Abstract The pressure derivative of the Curie temperature d T c /d p of the Heusler alloys Ni 2 MnZ(Z = Al, Ga, In, Sn and Sb) has been obtained from the results of temperature dependence of initial permeability under pressure up to about 6 kbar. For all alloys the Curie temperatures increase linearly with increasing pressure at the rate of d T c /d p : +0.7 K/kbar for Ni 2 MnAl, +1.0 K/kbar for Ni 2 MnGa, +0.9 K/kbar for Ni 2 MnIn, +1.4 K/kbar for Ni 2 MnSn and +4.1 K/kbar for Ni 2 MnSb. On the basis of these results, the interatomic dependence of the exchange interaction for Heusler alloys is discussed. The magnetic susceptibilities of those alloys are also reported.

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