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Time-of-flight elastic and inelastic neutron scattering studies on the localized 4d electron layered perovskite La$$_5$$Mo$$_4$$O$$_{16}$$

飛行時間法による中性子弾性散乱および非弾性散乱を用いた局在4d電子系層状ペロブスカイト化合物La$$_5$$Mo$$_4$$O$$_{16}$$の研究

飯田 一樹*; 梶本 亮一 ; 水野 雄介*; 蒲沢 和也*; 稲村 泰弘; 星川 晃範*; 吉田 幸彦*; 松川 健*; 石垣 徹*; 河村 幸彦*; 井深 壮史*; 横尾 哲也*; 伊藤 晋一*; 勝藤 拓郎*

Iida, Kazuki*; Kajimoto, Ryoichi; Mizuno, Yusuke*; Kamazawa, Kazuya*; Inamura, Yasuhiro; Hoshikawa, Akinori*; Yoshida, Yukihiko*; Matsukawa, Takeshi*; Ishigaki, Toru*; Kawamura, Yukihiko*; Ibuka, Soshi*; Yokoo, Tetsuya*; Ito, Shinichi*; Katsufuji, Takuro*

The magnetic structure and spin wave excitations in the quasi-square-lattice layered perovskite compound La$$_5$$Mo$$_4$$O$$_{16}$$ were studied by a combination of neutron diffraction and inelastic neutron scattering techniques using polycrystalline sample. Neutron powder diffraction refinement revealed that the magnetic structure is ferrimagnetic in the $$ab$$ plane with antiferromagnetic stacking along the $$c$$-axis. The inelastic neutron scattering results display strong easy-axis magnetic anisotropy along the $$c$$-axis due to the spin-orbit interaction in Mo ions. The model Hamiltonian consisting of in-plane anisotropic exchange interactions, the interlayer exchange interaction, and easy-axis single-ion anisotropy can explain our inelastic neutron scattering data well. Strong Ising-like anisotropy and weak interlayer coupling compared with the intralayer exchange interaction can explain both the high-temperature magnetoresistance and long-time magnetization decay recently observed in La$$_5$$Mo$$_4$$O$$_{16}$$.

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パーセンタイル:100

分野:Physics, Multidisciplinary

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