Abstract
We have performed a neutron diffraction experiment on Pr-doped Ce0.5Pr0.1La0.4B6, in which an antiferromagnetic octupole order with \(\boldsymbol{{q}} = (1/2,1/2,1/2)\) could be anticipated by analogy with Ce0.7La0.3B6. Contrary to this natural expectation, we detected an unambiguous magnetic peak at \(\boldsymbol{{q}} = (1/4,1/4,1/2)\), which is the same q-vector frequently realized in the magnetic ordered phases of RB6 (R = rare earth) compounds. No significant signal was observed at \(\boldsymbol{{q}} = (1/2,1/2,1/2)\) at zero magnetic field. This result shows that the normal antiferromagnetic dipole moment is also one of the competing multipole order parameters in the CexLa1−xB6 system. The relevant order parameters are close in energy and can be tuned by a weak perturbation.
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