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Sheng, J.*; Wang, L.*; Candini, A.*; Jiang, W.*; Huang, L.*; Xi, B.*; Zhao, J.*; Ge, H.*; Zhao, N.*; Fu, Y.*; et al.
Proceedings of the National Academy of Sciences of the United States of America, 119(51), p.e2211193119_1 - e2211193119_9, 2022/12
Although considerable progress has been made in the theoretical understanding of the low-dimensional frustrated quantum magnets, experimental realizations of a well-established scaling analysis are still scarce. This is particularly true for the two-dimensional antiferromagnetic triangular lattices. Owing to the small exchange strength, the newly discovered compound NaBaCo(PO) provides a rare opportunity for clarifying the quantum criticality in an ideal triangular lattice with quantum spin S=1/2. In addition to the establishment of the complete phase diagrams, the spin Hamiltonian with a negligible interplane interaction has been determined through the spin wave dispersion in the polarized state, which is consistent with the observation of a two-dimensional quantum critical point with the Bose-Einstein condensation of diluted free bosons.
Tong, L.*; 南部 健一*; 平田 洋介*; 泉 幹雄*; 宮本 泰明; 山口 大美
Japanese Journal of Applied Physics, Part 1, 45(10B), p.8217 - 8220, 2006/10
被引用回数:0 パーセンタイル:0(Physics, Applied)線で電離したイオンの空気輸送を解析するためのテスト粒子モンテカルロ法を開発した。得られた結果は、放射能計測装置の設計・開発に有用なデータである。構築したイオン-分子衝突モデルは実測値とよく合う。正負イオンの再結合はNanbu & Denpohの方法で扱った。0.0011atmのガス圧力に対し、イオン流れ場の定常状態を実現できた。