Modified anisotropy and distinct phase diagrams in the nearly isotropic S=1 triangular-lattice antiferromagnet Rb2Ni(SeO3)2
Abstract
The triangular-lattice antiferromagnet serves as a benchmark platform for realizing exotic quantum phases, in which magnetic anisotropy plays an essential role. In this work, we report modified magnetic anisotropy and phase diagrams in the nearly isotropic S=1 triangular-lattice antiferromagnet Rb2Ni(SeO3)2, compared with those of its isostructural analog K2Ni(SeO3)2. The magnetic susceptibility of Rb2Ni(SeO3)2 exhibits an easy-axis anisotropy with gc > gab, opposite to the easy-plane anisotropy observed in K2Ni(SeO3)2. The single Néel transition observed at zero field splits into two transitions at around 10~T, and a magnetization plateau is observed between 21~T and 37~T for both out-of-plane (H∥ c) and in-plane (H∥ ab) field directions in Rb2Ni(SeO3)2. We construct magnetic phase diagrams that are distinct between Rb2Ni(SeO3)2 and K2Ni(SeO3)2. These findings highlight the sensitivity of field-induced magnetic phase behavior to anisotropy in nearly isotropic triangular-lattice antiferromagnets.
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BibTeX
@misc{gui2026modified,
title = {{Modified anisotropy and distinct phase diagrams in the nearly isotropic $S=1$ triangular-lattice antiferromagnet $\mathrmRb_2Ni(SeO_3)_2$}},
author = {Xuejuan Gui and Xu-Guang Zhou and Chen Zhang and Zhongcen Sun and Yuan Sun and Chenglin Shang and Akira Matsuo and Yasuhiro H. Matsuda and Koichi Kindo and Henrik M. Rønnow and Weiqiang Yu and Rong Yu and Peng Cheng and Juanjuan Liu and Jieming Sheng and Jinchen Wang},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.21154},
eprint = {2610.21154},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.21154},
}
RIS
TY - UNPB
TI - Modified anisotropy and distinct phase diagrams in the nearly isotropic S=1 triangular-lattice antiferromagnet Rb_2Ni(SeO_3)_2
AU - Xuejuan Gui
AU - Xu-Guang Zhou
AU - Chen Zhang
AU - Zhongcen Sun
AU - Yuan Sun
AU - Chenglin Shang
AU - Akira Matsuo
AU - Yasuhiro H. Matsuda
AU - Koichi Kindo
AU - Henrik M. Rønnow
AU - Weiqiang Yu
AU - Rong Yu
AU - Peng Cheng
AU - Juanjuan Liu
AU - Jieming Sheng
AU - Jinchen Wang
PY - 2026
DA - 2026/10/15
PB - arXiv
DO - 10.48550/arxiv.2610.21154
UR - https://arxiv.org/abs/2610.21154
AB - The triangular-lattice antiferromagnet serves as a benchmark platform for realizing exotic quantum phases, in which magnetic anisotropy plays an essential role. In this work, we report modified magnetic anisotropy and phase diagrams in the nearly isotropic S=1 triangular-lattice antiferromagnet Rb_2Ni(SeO_3)_2, compared with those of its isostructural analog K_2Ni(SeO_3)_2. The magnetic susceptibility of Rb_2Ni(SeO_3)_2 exhibits an easy-axis anisotropy with g_c > g_ab, opposite to the easy-plane anisotropy observed in K_2Ni(SeO_3)_2. The single Néel transition observed at zero field splits into two transitions at around 10~T, and a magnetization plateau is observed between 21~T and 37~T for both out-of-plane (H∥ c) and in-plane (H∥ ab) field directions in Rb_2Ni(SeO_3)_2. We construct magnetic phase diagrams that are distinct between Rb_2Ni(SeO_3)_2 and K_2Ni(SeO_3)_2. These findings highlight the sensitivity of field-induced magnetic phase behavior to anisotropy in nearly isotropic triangular-lattice antiferromagnets.
ER -