Abstract
X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), magnetization and magnetic susceptibility of Mn 1− x Al x Ni alloys are reported. A change in the crystallographic structure takes place around x=0.4 from CuAuI to CsCl (B2) structure type. For x0.5 a mixed B2+L2 1 state exists which incorporates antiferromagnetic (B2) and ferromagnetic (L2 1) parts. A direct evidence for the existence of local moments on Mn sites in Mn 1- x Al x Ni alloys is given by the exchange splitting of XPS Mn 3s and Mn 2p3/2 core levels. The gradual filling of the Ni 3d band as the Al concentration increases can be explained by the hybridization of the Ni 3d band and Al 3sp states.
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