Abstract

The magnetic structure of SmRu 4 P 12 has been investigated by neutron diffraction. Long-range antiferromagnetic ordering with a propagating vector of q =(1,0,0) was observed below the metal–insulator transition temperature ( T MI =16.5 K). Data obtained at T =3.3 K were analyzed with dipole magnetic moments of µ=0.30 µ B at Sm sites. The results suggest that the primary order parameter is the T α , or T β octupole accompanied by strong mixing with T α and dipoles.

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