Nonlinear Susceptibility and Specific Heat of (Pd0.9966Fe0.0034)0.95Mn0.05

The linear and nonlinear susceptibilities χ 0 t , χ 1 t h 0 and χ 2 t h 0 2 of (Pd 0.9966 Fe 0.0034 ) 0.95 Mn 0.05 alloy, were measured around T c (8.0 K). The anomalous temperature dependence of χ 2 t h 0 2 above and below T c is qualitatively explained by a simple molecular field theory and the field dependence of χ 2 t h 0 2 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, 2 Δ =3.2±0.3, were obtained in an inhomogeneous ferromagnet (Pd 0.9966 Fe 0.0034 ) 0.95 Mn 0.05 . The specific heat had a peak value at T c , but no anomaly was observed.