Antiferromagnetism of γ-FeMn Alloys. III. : Specific Heat and Thermoelectric Power Studies

概要

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The specific heat and the thermoelectric power of γ-FeMn alloys were measured for three different compositions. The peak of the specific heat at the Neel temperature is broad for Fe_<70>Mn_<80> but it becomes sharp when the concentration of Fe decreases. This tendency is interpreted in terms of the temperature variation of the sublattice magnetization of the alloys. The magnetic entropies obtained are 1.4, 0.83 and 0.57 cal/mol. deg. for Fe_<70>Mn_<30>, Fe_<60>Mn_<40> and Fe_<50>Mn_<50> respectively. These values are nearly a half of those estimated for the localized spin system. The thermoelectric power is also strongly composition dependent. The temperature dependence of the thermoelectric power suggests that two types of carriers exists in the alloys. Only a small anomaly was observed at the Neel temperature. The results suggest that the antiferromagnetism of γ-FeMn alloys is distinctly different from that of Cr.
社団法人日本物理学会の論文
1967-08-05