Resonant X-Ray Diffraction Study of Multipole Ordering in the Ferromagnetic Compound CePd3S4

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Resonant X-ray diffraction experiments on CePd3S4 were performed at the Ce-L_{3} absorption edge to study the states of quadrupolar ordering below the ferromagnetic transition temperature T_{\text{C}} = 6.3 K. The magnetic structure of CePd3S4 was reported as a canted ferromagnetic structure with a canting angle of 51°. It has therefore been pointed out that the complex magnetic structure arises from the simultaneous ordering of quadrupole moments. We observed the azimuthal angle dependence of the diffraction intensity of two forbidden reflections, specifically, 003 and 104 reflections, for both \pi--\pi' and \pi--\sigma' scattering processes. The results revealed that O_{2}^{0}-type antiferroquadrupolar ordering coexists with magnetic ordering. We infer that the magnetic structure of CePd3S4 is not a canted structure but a ferrimagnetic structure and that the quadrupole moment is also a primary-order parameter. These findings well explain the anomalously high transition temperature of CePd3S4, which is very much higher than the magnetic transition temperature of 0.06 K estimated from de Gennes rule.
2012-04-15