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Ba$$_{3}$$Co$$_{1-x}$$Ca$$_{x}$$Ru$$_{2}$$O$$_{9}$$の結晶構造と磁気構造

Crystal and Magnetic Structures of Ba$$_{3}$$Co$$_{1-x}$$Ca$$_{x}$$Ru$$_{2}$$O$$_{9}$$

堀江 映仁*; 安井 幸夫*; 五十嵐 太一*; 山本 貴史*; 三澤 一輝*; 寺崎 一郎*; 松川 健*; 星川 晃範*; 石垣 徹*; 井川 直樹   

Horie, Akihiro*; Yasui, Yukio*; Igarashi, Taichi*; Yamamoto, Takafumi*; Misaswa, Kazuki*; Terasaki, Ichiro*; Matsukawa, Takeshi*; Hoshikawa, Akinori*; Ishigaki, Toru*; Igawa, Naoki

Ba$$_{3}$$Co$$_{1-x}$$Ca$$_{x}$$Ru$$_{2}$$O$$_{9}$$多結晶試料に対して中性子回折実験及び磁化率・比熱の測定を実施した。Ca置換量${it x}$の増加に伴い磁気転移温度$$T_mathrm{N}$$は減少し、${it x}$ =0.3では$$T_mathrm{N}$$ = 76Kまで下がることが分かった。中性子結晶構造解析から、Co$$^{2+}$$よりもイオン半径の大きなCa$$^{2+}$$に置換することで格子定数は増加するが、その一方で、Ru-Ruボンド長は縮小することが分かった。講演ではBa$$_{3}$$Co$$_{1-x}$$Ca$$_{x}$$Ru$$_{2}$$O$$_{9}$$の磁気特性や磁気状態の詳細について議論する。

The crystal and magnetic structures of Ba$$_{3}$$Co$$_{1-x}$$Ca$$_{x}$$Ru$$_{2}$$O$$_{9}$$ has been studied by using the neutron powder diffraction. We also carried out the measurements of magnetic properties of this sample. $$T_mathrm{N}$$ is decreased with increasing the fraction of Ca ion, and we found that $$T_mathrm{N}$$ is 76 K at the fraction of Ca = 0.3. although the lattice constants of the sample are increased by the substituting Ca for Co ion, a Ru-Ru bond length decreases with increasing fraction of Ca ion. In this presentation, the details of the magnetic properties and magnetic structure of this material will be discussed.

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