Abstract
We conducted X-ray and neutron diffraction experiments and magnetic susceptibility measurements for γ-MnFe alloys with a small amount of Cu or Pt, and for γ-MnCu and γ-MnZn alloys. γ-(Mn1-xFex)0.95Cu0.05 alloy with x=0.26 around 10 K shows a face-centered orthorhombic structure with a=0.3681, b=0.3655 and c=0.3622 nm, and a non-collinear antiferromagnetic structure with μa=0 and μb/μc=0.62. With increasing temperature, orthorhombic-tetragonal with c/a>1 structural transition occurs at To(=125 K) and the tetragonal structure finally transforms to a cubic structure at Tt(=352 K), which is lower than the Néel temperature TN(=440 K). The γ-(Mn1-xFex)0.95Pt0.05 alloy with x=0.13 at 10 K also shows a similar structure with a=0.3745, b=0.3714 and c=0.3649 nm, which has a non-collinear antiferromagnetic structure with μa=0, μb=1.03 and μc=1.65 μB/(Mn or Fe) atom. However, the γ-Mn1-xCux alloy with x≤0.26 and γ-Mn1-xZnx alloy with x≤0.28 show a tetragonal structure with c/a<1 at low temperature.
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