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Spin correlations in a frustrated spinel antiferromagnet LiCrMnO$$_4$$

フラストレートしたスピネル反強磁性体LiCrMnO$$_4$$のスピン相関

松田 雅昌; 本多 善太郎*; 香取 浩子*; 高木 英典*; 植田 浩明*; 上田 寛*; 三田村 裕幸*; 金道 浩一*

Matsuda, Masaaki; Honda, Zentaro*; Katori, Hiroko*; Takagi, Hidenori*; Ueda, Hiroaki*; Ueda, Yutaka*; Mitamura, Hiroyuki*; Kindo, Koichi*

LiCrMnO$$_4$$ shows an interesting behavior in magnetic field. Magnetization in LiCrMnO$$_4$$ gradually increases and saturates at $$sim$$1/2 of the full moment (3$$mu_B$$). This phenomenon is similar to the half-magnetization plateau observed in ACr$$_2$$O$$_4$$ (A: Cd and Hg), which originates from a strong spin-lattice coupling. We performed neutron scattering experiments in LiCrMnO$$_4$$4 in magnetic field up to 10 T to clarify the origin of the plateau-like state. It was found that the magnetic peak at $$Qsim$$0.6 $AA$^{-1}$$ is suppressed with increasing magnetic field although the magnetic peak at $$Qsim$$1.6 $AA$^{-1}$$ is robust. This result suggests that the saturation of the magnetization is not related with the spin-lattice coupling as in ACr$$_2$$O$$_4$$ but spins in phase 2 first align ferromagnetically in low magnetic field. This indicates that the magnetic interactions in phase 2 are relatively small, suggesting that the phase 2 is formed by further-neighbor interactions.

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