Resonant X-ray diffraction study of multipole ordering in DyPdS

Michimura, Shinji; Inami, Toshiya; Otsubo, Toru*; Matsumura, Takeshi*; Tanida, Hiroshi*; Sera, Masafumi*; Matsuoka, Eiichi*; Watahiki, Masanori*; Tanigaki, Katsumi*; Onodera, Hideya*

In DyPdS, powder neutron diffraction, specific heat, and magnetization measurements revealed an antiferroquadrupolar transition at T=2.7 K, and two magnetic transitions at T=0.84 K and T=0.55 K. We performed resonant X-ray diffraction experiments at the Dy- absorption edge to study the states of multipolar ordering in a single crystal of DyPdS at BL22XU in SPring-8. We measure the diffraction intensity of the 300 forbidden reflection for -' and -' scattering processes as a function of temperature. No intensity is observed for the -' scattering process. On the other hand, for the -' scattering process, the intensity grows below T and is therefore unambiguously related to the multipolar order parameter. We report detailed results obtained under magnetic field too.