Small-angle neutron-scattering studies of Ce(Fe1− x Al x )2

Ce(Fe1−xAlx)2, with x=0, 0.06, and 0.14, has been studied by small-angle neutron scattering in order to investigate the instability of the ferromagnetic state in the pure material to small amounts of magnetic disorder. The pure material (x=0) displays a ferromagnetic transition near TC=225 K, and more complicated behavior below ∼100 K. The disordered alloys, x=0.06 and x=0.14, display ferromagnetic-like states over relatively narrow temperature …