Abstract
We have investigated the physical properties of Ce 0.7 Pr 0.3 B 6 in order to clarify the doping effect on the multipolar interactions in CeB 6 and PrB 6 . As a result of the suppression of the antiferro-quadrupolar ordering temperature T Q and the enhancement of T N by Pr doping, six long-range ordered (LRO) phases appear. T Q exhibits a smooth increase with increasing magnetic field as in CeB 6 . At a high magnetic field, above ∼10 T, only phase II exists. As for the three LRO phases below ∼10 T and below T Q , there exists a possibility of incommensurate quadrupolar and magnetic ordering. A new question of how the quadrupolar ordering is compatible with the magnetic ordering appears in the present study. The coexistence of the magnetic and quadrupolar orderings in Ce 0.7 Pr 0.3 B 6 indicates that the strong Ce–Pr interaction is different from the weak Ce–Nd interaction in Ce x Nd 1- x B 6 .
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