Antiferromagnetic Alignment of Magnetic Dipolar Moments Observed by Neutron Powder Diffraction in Rare-Earth Palladium Bronze PrPd3S4

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Neutron powder diffraction and inelastic-neutron-scattering experiments have been performed on PrPd3S4 as well as magnetization and magnetic-susceptibility measurements of single-crystalline samples to examine the order parameter below $T_{\text{M}} = 1.56$ K. From the results of the inelastic-neutron-scattering and magnetization measurements, the ground state of the $J$-multiplet of Pr3+ under a cubic crystalline electric field with Th symmetry was determined to be the $\Gamma_{4}{}^{(2)}$ triplet with the first excited state situated above 390 K. Since the dipolar operator and the $T^{\alpha}$- and $T^{\beta}$-type octupolar operators are proportional to the same matrix with the bases of the ground $\Gamma_{4}{}^{(2)}$ triplet, the antiferromagnetic (AFM) alignment of the magnetic dipolar moments below $T_{\text{M}}$ observed in the neutron powder diffraction experiment implies two possible ordering states, i.e., AFM ordering induced by a dipolar interaction and antiferro-octupolar ordering induced by an octupolar interaction.
2010-06-15