Abstract
Neutron diffraction (ND) measurements on U(Fe 1− x Mn x ) 2Ge 2 with x=0.5 and 1 have been carried out in the temperature range 10–300 K with a view to understand the nature of magnetic ordering and the effect of selective site substitution on magnetic moments. The profile analysis of the ND patterns shows that the moment on U is reduced to 0.5 μ B while μ Fe/Mn is 1.4 μ B, at 10 K. It is also observed that the distance between U and transition metal site, d U−T is, reduced to 3.291 Å for UFeMnGe 2 from a value of 3.364 Å for UMn 2Ge 2. We discuss these results in terms of hybridization between uranium 5f electrons and the transition metal 3d electrons resulting from the changed 3d environment and the distance d U−T, leading to a reduction or total suppression of the U moment.
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