The effect of multipolar fluctuations on the quadrupolar phase transition in CeB6 is investigated theoretically. It is shown that the fluctuations become strong and field-dependent, reflecting the competition of coupled multipolar interactions. Some unusual phenomena around the transition in CeB6 are shown to be reasonably explained within the RKKY model.
PACS numbers: 71.27.+a, 75.30.Mb
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