Abstract

Experimental studies of polycrystalline Mn2FeAl revealed that it crystallizes in a primitive cubic structure of β-Mn type (space group P4132) and is an antiferromagnet with Néel temperature TN = 40 K. The alloy exhibits temperature dependence of transport properties typical for semiconductors and has abnormally high electrical resistivity (ρ ∼ 238 μΩ·cm at room temperature). High Curie-Weiss temperature ΘCW ∼ –905 K and a large value of the frustration parameter ƒ ≈ 23 points to a strong frustration of the magnetic subsystem. These experimental findings are in contrast with reported results of first-principles calculations which predicted Mn2FeAl to be half metallic ferrimagnet crystallizing in the Heusler crystal structure.

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