Abstract
By nuclear specific heat measurements in the anomalous ordered phase of SmRu 4 P 12 , the size of the ordered Sm dipole moment m Sm has been determined accurately. The strongly reduced value of m Sm agrees perfectly with a mean-field model calculation, providing evidence that the dipole moments appear as a secondary order parameter in an octupole ordering. In the quite rare examples of octupole ordering in NpO 2 and Ce 1 - x La x B 6 , no dipole moments are induced. In this sense, the ordered state in SmRu 4 P 12 provides a new example of octupole ordering with such unprecedented character.
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