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Dimensional crossover of low-energy magnetic excitation for delafossite oxide Cu$$_{1-x}$$Ag$$_{x}$$CrO$$_{2}$$ with a spin-3/2 antiferromagnetic triangular sublattice

スピン2/3の反強磁性三角格子を有するデラフォサイト酸化物Cu$$_{1-x}$$Ag$$_{x}$$CrO$$_{2}$$における低エネルギー磁気励起の次元クロスオーバー

奥田 哲治*; 岸本 泰造*; 宇都 数馬*; 外園 貴久*; 小野瀬 佳文*; 十倉 好紀*; 梶本 亮一  ; 松田 雅昌

Okuda, Tetsuji*; Kishimoto, Taizo*; Uto, Kazuma*; Hokazono, Takahisa*; Onose, Yoshinori*; Tokura, Yoshinori*; Kajimoto, Ryoichi; Matsuda, Masaaki

Dimensional crossover from anisotropic-3-dimensional (3D) to 2D low-energy magnetic excitations was found in delafossite oxide Cu$$_{1-x}$$Ag$$_{x}$$CrO$$_{2}$$ having a spin-3/2 antiferromagnetic (AF) triangular lattice. The crossover is evidenced by a decrease in AF transition temperature ($$T_mathrm{N}$$), distinct 2D magnetic excitations above $$T_mathrm{N}$$ for Cu$$_{0.85}$$Ag$$_{0.15}$$CrO$$_{2}$$, a disappearance of a peak of magnetic specific heat ($$C_mathrm{mag}$$) around $$T_mathrm{N}$$, and a successive change from $$T^3$$ to $$T^2$$ dependence of low-$$T$$ $$C_mathrm{mag}$$ accompanying a low-$$T$$ shift of magnetic entropy. These results may suggest a gradual change from AF to spin-liquid like states with an increase in $$x$$.

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パーセンタイル:22.7

分野:Physics, Multidisciplinary

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