Z. Zolnierek et J. Mulak, MAGNETISM AND CRYSTAL-FIELD EFFECT IN THE THCR2SI2-TYPE URANIUM TERNARIES, Journal of magnetism and magnetic materials, 144, 1995, pp. 1393-1396
Most of the U-intermetallics with the ThCr2Si2-type crystal structure
exhibit magnetic ordering driven by the RKKY-type interactions. Some o
f them show anomalous magnetic behaviour which can not be explained in
the framework of the RKKY model only. Incorporating the hybridization
effects to the crystal field potential and considering lattice imperf
ections we show that such anomalies may be induced by an effective qua
drupole-quadrupole interaction.