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Magnetic properties and crystal structure of honeycomb lattice system Li$$_{3}$$Ni$$_{2}$$SbO$$_{6}$$

ハニカム格子システム系磁性物質Li$$_{3}$$Ni$$_{2}$$SbO$$_{6}$$の磁気特性と結晶構造

福井 皓人*; 安井 幸夫*; 井川 直樹   ; 松川 健*; 吉田 幸彦*; 星川 晃範*; 石垣 徹*

Fukui, Akito*; Yasui, Yukio*; Igawa, Naoki; Matsukawa, Takeshi*; Yoshida, Yukihiko*; Hoshikawa, Akinori*; Ishigaki, Toru*

粉末中性子回折法を用いた結晶構造解析によって、ハニカム格子システム系磁性物質Li$$_{3}$$Ni$$_{2}$$SbO$$_{6}$$の構造が理想的なハニカム格子からおよそ0.1%ひずみんでいる単斜晶(空間群:${it C}$ 2/${it m}$)であることを明らかにした。磁化率の温度依存性から求めたワイス温度は12.2Kであり、Ni$$^{2+}$$のスピン間の強磁性相互作用が支配的である磁気特性を示した。その一方で13.5Kにおいて反強磁性転移が見出され、その磁気特性は単純ではない。本報ではLi$$_{3}$$Ni$$_{2}$$SbO$$_{6}$$の結晶・磁気構造と磁気特性の相関関係の詳細について議論する。

The powder neutron crystal structure analysis and measurements of the magnetization and the specific heat have been carried out for the honeycomb lattice spin system Li$$_{3}$$Ni$$_{2}$$SbO$$_{6}$$. From the Rietveld analysis of the neutron diffraction data, we determined the crystal structure of Li$$_{3}$$Ni$$_{2}$$SbO$$_{6}$$, where the space group is ${it C}$ 2/${it m}$ monoclinic and the distortion from ideal honeycomb lattice is $$sim$$0.1 % only. The Weiss temperature $$theta_mathrm{w}$$ obtained from the temperature dependence of magnetic susceptibility is 12.2 K, indicating that dominant interaction between the Ni$$^{2+}$$ spins is ferromagnetic one. However, from the behavior of the magnetic susceptibility and the specific heat, Li$$_{3}$$Ni$$_{2}$$SbO$$_{6}$$ is found to exhibit an antiferromagnetic transition at $$T_mathrm{N}$$ = 13.5 K.

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