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Low-energy spin fluctuations in CuCrO$$_{2}$$ and Cu$$_{0.85}$$Ag$$_{0.15}$$CrO$$_{2}$$ studied by inelastic neutron scattering

CuCrO$$_{2}$$とCu$$_{0.85}$$Ag$$_{0.15}$$CrO$$_{2}$$における低エネルギースピン揺らぎの非弾性中性子散乱による研究

梶本 亮一  ; 中島 健次  ; 河村 聖子  ; 稲村 泰弘 ; 奥田 哲治*; 富安 啓輔*

Kajimoto, Ryoichi; Nakajima, Kenji; Kawamura, Seiko; Inamura, Yasuhiro; Okuda, Tetsuji*; Tomiyasu, Keisuke*

Two-dimensional triangular-lattice Heisenberg antiferromagnet (TLHA) is one of the simplest examples of the geometrical frustration, where nontrivial spin states are expected due to the frustration. CuCrO$$_{2}$$ is one of the TLHAs where the $$S$$ = 3/2 spins of Cr$$^{3+}$$ ions form the triangular-lattice. The spins show a three-dimensional ordering with a proper screw structure below $$T_N$$ = 24 K. To find nontrivial spin fluctuations in addition to the conventional spin wave, we have studied the magnetic excitations by inelastic neutron scattering using the chopper spectrometer AMATERAS at J-PARC. We found that the excitation spectrum shows an additional diffusive quasielastic component at temperatures ($$T$$'s) slightly below $$T_N$$ and $$T > T_N$$. This diffuse scattering shows the different $$T$$ dependence from that of the spin wave excitations, as well as a characteristic $$Q$$ dependence. We argue the origin of the diffuse scattering in terms of the $$Z_2$$-vortex and spin molecules.

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