The electronic specific heat coefficient γ, and the high field susceptibility χhf of the L21 phase in Co-based Heusler alloys were investigated in order to relate these properties to the spin polarization P. The γ-values of Co2CrGa, Co2MnGa and Co2FeGa alloys are comparable to the theoretical values of the total density of states at the Fermi energy. The value of χhf for Co2CrGa alloy having a high spin polarization of about 95% is significantly low on the order of 10-4 μB/f.u.-T. In contrast, χhf for Co2FeGa alloy having a theoretical P value of 37% is one order larger than that for Co2CrGa alloy. These results imply that there is a relation between χhf and P of the present Co-based Heusler alloys.
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