HYBRIDIZATION MODEL FOR THE MAGNETIC-ORDERING BEHAVIOR OF URANIUM-BASED AND CERIUM-BASED 1/2/2-INTERMETALLIC COMPOUNDS

It is shown that the occurrence of magnetic ordering in UT2X2 and CeT2X2 intermetallic compounds, where T denotes a transition metal and X represents Si or Ge, and the magnetic-ordering temperatures in those compounds that order magnetically, are related to the strength of the f-d hybridization. Values for this hybridization strength in various series of such ternary and pseudoternary compounds are obtained via a semiquantitative band-structural approach, and the systematics in these values are used to determine the ordering trends in the phase diagram of a Kondo lattice.