Antiferroquadrupolar Ordering and Anisotropic Magnetic Phase Diagram of Dysprosium Palladium Bronze, DyPd_3S_4(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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From the measurements of magnetization and specific heat, we constructed B-T phase diagrams of single-crystalline DyPd_3S_4 which is known to exhibit antiferroquadrupolar (AFQ) and antiferromagnetic (AFM) ordering at low temperatures. The phase diagrams are found to be highly anisotropic and re-entrant, which are typical of rare-earth compounds exhibiting multipolar ordering. The crystalline electric field (CEF) scheme of Dy^<3+> in DyPd_3S_4 was deduced from the specific heat and magnetization measurements of the Y-diluted compounds Dy_<1-x>Y_xPd_3S_4 (0.1≤x≤0.9) and discussed in detail. The CEF ground state was determined to be the orbitally-degenerated quartet Γ_<67>^<(1)>, and the overall splitting width was estimated to be about 104K. No correlation was found between the anisotropy of T_Q and that of the Zeeman splitting width of the ground quartetΓ_<67>^<(1)>.
社団法人日本物理学会の論文
2007-08-15