Pressure Effects Estimated from Forced Volume Magnetostriction for Ni–M (M=Ti, V) Alloys

Abstract

The temperature dependence of forced volume magnetostriction dω⁄dH for Ni_1−xTi_x (x≤0.1) and Ni_1−xV_x (x≤0.08) alloys has been measured using the 3-terminal capacitance method. The values of dω⁄dH for Ni∼8 at%Ti–Ni and ∼6 at%V–Ni alloys change their sign from positive to negative with raising the temperature. Pressure coefficients, d ln μ⁄dp and d ln T_c⁄dp, have been deduced from the temperature dependence of dω⁄dH using the thermodynamical and the Kornetzki-Kouvel relations. The relation between two pressure coefficients above are analysed according to Inoue and Shimizu’s discussion. The values of the coefficient C⁄χ_hfT_c obtained decrease gradually from 2 to 1 with decreasing T_c toward 0 K for both alloy systems.