Abstract
We discuss multipole ordering in two cubic f-electron compounds. Field variation of the antiferroquadrupolar transition temperature T Q in PrPb 3 is determined by the specific heat and the magnetization measurements. It is found that T Q( H) shows a pronounced increase for H∥〈100〉, which has been successfully explained by the antiferromagnetic interaction between the field-induced staggered moment in the O 2 0(∝2 J z 2− J x 2− J y 2) AFQ phase. From the analysis of the anisotropy in T Q( H), the importance of an octupolar interaction is pointed out. The new ordered state in Ce x La 1− x B 6 ( x<0.8), called phase IV, has been examined by magnetization measurements under uniaxial pressures. A pronounced anisotropy is observed at a relatively weak pressure, and the ordering temperature seems to increase in magnetic field. The results are discussed in view of a possible octupolar ordering in phase IV.
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