サイエンス記事
フラストレートハイゼンベルク磁性体NaCrO2におけるトポロジカルなZ2渦揺らぎの中性子散乱による観測
2023 年 33 巻 4 号 p. 138-141
詳細
2023 年 33 巻 4 号 p. 138-141
Spin fluctuations in the triangular-lattice Heisenberg antiferromagnet NaCrO2 are investigated by means of quasi-elastic neutron scattering with high energy resolution and a wide energy band. Two components with the following features are captured separately. They are pronounced at intermediate temperatures of 20 to 50 K. One, with quite an extended lifetime corresponding to ∼0.001Eex (Eex is the exchange energy), nearly disappears at low temperature (10 K), and the other, with an extended lifetime of ∼0.01Eex, survives there, identified as the free Z2 vortex and Z2-vortex pair, respectively, in agreement with the Z2-vortex theory. [This article briefly introduces the published paper, K. Tomiyasu et al., Phys. Rev. B 106, 054407 (2022). Please see it for details.]
