  The low temperature, magnetic phase transition in LuFe2Ge2 is thought to be
associated with itinerant magnetism. The effects of Y and Sc substitutions on
the Lu site, as well as Ru and Co substitutions on the Fe site, on the low
temperature magnetic phase transition of LuFe2Ge2 compound have been studied in
single crystals via microscopic, thermodynamic and transport measurements. On
one hand, Co substitution suppresses the transition below our base temperature
of 2 K even at our lowest substitution level. On the other hand, Sc
substitution enhances the transition temperature, and Y or Ru substitution
suppresses the transition to lower temperature. Phase diagrams for Y, Sc and Ru
substitutions have been constructed and the possibility of a unifying,
composite diagram is discussed.
