Change in the magnetic ground state of LaFe_11.4Al_1.6 compound by the substitution of Mn for Fe

The structure and magnetic properties of La(Fe_1-xMn_x)_11.4Al_1.6 (0≤x≤0.25)compounds have been studied. The NaZn_13-type structure is preserved and the lattice parameter increases linearly with increasing the Mn concentration. The magnetic ground state changes from the antiferromagnetic to the spin-glass or the cluster-glass state by the substitution of Mn for Fe. Furthermore, a field-induced transition from cluster glass to ferromagnet is found for the samples with x=0.05 and 0.10.