Nonlinear Susceptibility and Specific Heat of (Pd_0.9966Fe_0.0034)_0.95Mn_0.05

抄録

The linear and nonlinear susceptibilities χ₀^t, χ₁^th₀ and χ₂^th₀² of (Pd_0.9966Fe_0.0034)_0.95Mn_0.05 alloy, were measured around T_c (8.0 K). The anomalous temperature dependence of χ₂^th₀² above and below T_c is qualitatively explained by a simple molecular field theory and the field dependence of χ₂^th₀² below T_c is well understood by the contribution of the ferromagnetic magnetization in magnetic domains. In the experiment, the susceptibility exponent, γ=1.8±0.2, and the gap parameter, 2Δ=3.2±0.3, were obtained in an inhomogeneous ferromagnet (Pd_0.9966Fe_0.0034)_0.95Mn_0.05. The specific heat had a peak value at T_c, but no anomaly was observed.