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$$J_1$$-$$J_2$$モデルの一次元量子スピン系Cs$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$の磁気構造

Magnetic structure of 1D quantum spin system Cs$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ with $$J_1$$ - $$J_2$$ model

安井 幸夫*; 藤村 明央*; 大森 喜由*; 井川 直樹   ; 松川 健*; 吉田 幸彦*; 星川 晃範*; 石垣 徹*

Yasui, Yukio*; Fujimura, Akio*; Omori, Kiyoshi*; Igawa, Naoki; Matsukawa, Takeshi*; Yoshida, Yukihiko*; Hoshikawa, Akinori*; Ishigaki, Toru*

Cs$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$の粉末中性子回折実験を行い、磁気転移温度$$T_mathrm{N}$$以下での磁気構造を調べた。その結果、Cu$$^{2+}$$スピンは${it b}$軸方向にcollinearに配列し、リボン鎖内では強磁性的、リボン鎖間では反強磁性的な磁気構造をもつことが分かった。これは強磁性的な$$J_1$$が強く反映された磁気構造と考えられる。本講演では、この物質に関する磁気構造解析の詳細について報告する。

The magnetic structure of Cs$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ has been studied by using the neutron powder diffraction. Cu$$^{2+}$$ spins collinearly ordinate along the ${it b}$ axis and we found that this material has ferromagnetic structure in ribbon chains and antiferromagnetic structure between ribbon chains. Those results indicate that the magnetic structure is strongly inflected with ferromagnetic $$J_1$$. In this presentation, the detail of magnetic structure of this material will be discussed.

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