Abstract
Thermal expansion, temperature change of electrical resistance and its change due to hydrostatic pressure, and magnetic susceptibility were measured with some antiferromagnetic Fe-Mn alloys containing 30 to 40 at% Mn. It was found that an additional magnetic volume expansivity, δ V / V , due to an antiferromagnetic spin ordering is as large as 10 -3 ∼10 -4 , and the change of the Neel temperature with pressure, ∂ T N /∂ P , is about -2.5×10 -3 deg·Kg -1 ·cm 2 in 30 at% Mn alloy. With these values, the volume dependence of the molecular field constant, ∂ A /∂ω, is estimated to be positive by the molecular field theory with the localized moment model. The results are discussed in comparison with Bethe-Slater's and Weiss' theories and with the similar behavior in some ferromagnetic invar-type alloys.
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