Abstract
Abstract We present ultrasonic measurement of the ternary intermetallic compound Ce3Pd20Ge6, where quadrupolar ordering at TQ≈1.2 K occurs at a higher temperature than the antiferromagnetic ordering at TN=0.75 K. The Curie term in the quadrupolar susceptibility for the crystal-field ground-state Γ8 gives rise to a softening of the transverse modes (C11−C12)/2 and C44 above TQ. The most pronounced softening of 50% is observed for (C11−C12)/2 which suggests a ferroquadrupolar ordering of O02 or of O22 with Γ3 symmetry below TQ.
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