Abstract
YFe x Al 12− x ( x = 5.5 and 5.8) polycrystalline samples were prepared by induction melting and found to crystallize in the tetragonal ThMn 12-type structure. Mössbauer spectroscopy, magnetization, and AC-susceptibility measurements show a reentrant ferromagnetic behavior. Above room temperature, there is evidence of uncorrelated iron-rich nanoclusters with short-range ferro- or ferrimagnetic order. At T c approx. 230 K for YFe 5.5Al 6.5 and 270 K for YFe 5.8Al 6.2 a paramagnetic ferromagnetic-like transition takes place. At lower temperatures fall-offs of the DC-magnetization curves are observed. Analysis of the frequency and field dependence of the linear AC-susceptibility as well as of the higher harmonics reveal a cluster-glass behavior below 70 and 50 K for YFe 5.5Al 6.5 and YFe 5.8Al 6.2, respectively. Comparing with previous results T c as well as the ferromagnetic character of YFe x Al 12− x are found to increase with increasing Fe concentration.
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