Magnetic field induced antiferromagnetic (AF) Bragg reflections and superlattice reflections due to a crystal-structure modulation have been observed simultaneously by neutron diffraction in the low temperature phase of the filled-skutterudite PrFe4P12. The present result demonstrates that 4f electrons of Pr ions undergo antiferro-quadrupolar (AFQ) ordering accompanied by the structural phase transition. The field induced AF magnetic moment has been evaluated as 0.065\mu B at H = 5.0 T.
PACS numbers: 71.27.+a, 61.12.Ld, 75.30.Mb
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