Abstract
The crystal structure and magnetic properties of CeMn 2− x Fe x Ge 2 (0≤ x≤1.0) were studied by X-ray powder diffraction and DC magnetization measurements. All the compounds crystallize in ThCr 2Si 2-type structure. Substitution of Fe for Mn led to a decrease in the unit cell parameters and the unit-cell volume, whereas c/ a exhibits parabolic variations. For the samples with x=0.625 and 0.65, the SmMn 2Ge 2-like magnetic behavior was observed. The results of earlier neutron and Mössbauer studies in CeMn 2Ge 2 were also used for interpreting the magnetization data and to give an account of the competing effects between various magnetic structures in the Mn sublattice. The results are summarized in a preliminary magnetic phase diagram.
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