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| Main Authors: | , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2604.12489 |
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| _version_ | 1866911592061337600 |
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| author | Wang, Bin Cao, Yantao Liu, Andi Wu, Guoliang Zhou, Jin Ma, Xiaobai Yang, Wenyun Ohhara, Takashi Nakao, Akiko Munakata, Koji Shen, Bing Fu, Zhendong Tian, Zhaoming Tao, Qian Xu, Zhu-an Li, Wei Zhao, Jinkui Guo, Hanjie |
| author_facet | Wang, Bin Cao, Yantao Liu, Andi Wu, Guoliang Zhou, Jin Ma, Xiaobai Yang, Wenyun Ohhara, Takashi Nakao, Akiko Munakata, Koji Shen, Bing Fu, Zhendong Tian, Zhaoming Tao, Qian Xu, Zhu-an Li, Wei Zhao, Jinkui Guo, Hanjie |
| contents | Triangular-lattice systems host a variety of ground states, ranging from quantum spin liquids to magnetically ordered phases, the latter of which can exhibit a sequence of magnetic phase transitions under applied magnetic fields. Here, we report magnetic and thermodynamic measurements, combined with powder and single-crystal neutron diffraction, on a high-spin, nearly isotropic Mn$^{2+}$ triangular-lattice system K$_2$Mn(SeO$_3$)$_2$. The compound undergoes long-range magnetic ordering below $T_\mathrm{N} \sim 4$~K in zero field. Contrary to expectations for an ideal Heisenberg system, the compound adopts an up-down-zero (UD0) magnetic structure down to the lowest temperature (0.05 K), rather than the commonly expected Y-type structure. This UD0 state is, however, highly sensitive to external magnetic fields. For fields applied along the $c$ axis, it is readily destabilized and replaced by the Y-type structure, followed by an up-up-down (UUD) phase corresponding to the 1/3 magnetization plateau. In contrast, when the field is applied within the triangular plane, the system evolves into a canted Y state at a higher critical field. These results reveal that weak anisotropy, though small in magnitude, exerts a strongly orientation-dependent influence, playing a key role in selecting the field-induced phases in this frustrated magnet. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_12489 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Directional selection of field-induced phases by weak anisotropy in triangular-lattice K$_2$Mn(SeO$_3$)$_2$ Wang, Bin Cao, Yantao Liu, Andi Wu, Guoliang Zhou, Jin Ma, Xiaobai Yang, Wenyun Ohhara, Takashi Nakao, Akiko Munakata, Koji Shen, Bing Fu, Zhendong Tian, Zhaoming Tao, Qian Xu, Zhu-an Li, Wei Zhao, Jinkui Guo, Hanjie Strongly Correlated Electrons Triangular-lattice systems host a variety of ground states, ranging from quantum spin liquids to magnetically ordered phases, the latter of which can exhibit a sequence of magnetic phase transitions under applied magnetic fields. Here, we report magnetic and thermodynamic measurements, combined with powder and single-crystal neutron diffraction, on a high-spin, nearly isotropic Mn$^{2+}$ triangular-lattice system K$_2$Mn(SeO$_3$)$_2$. The compound undergoes long-range magnetic ordering below $T_\mathrm{N} \sim 4$~K in zero field. Contrary to expectations for an ideal Heisenberg system, the compound adopts an up-down-zero (UD0) magnetic structure down to the lowest temperature (0.05 K), rather than the commonly expected Y-type structure. This UD0 state is, however, highly sensitive to external magnetic fields. For fields applied along the $c$ axis, it is readily destabilized and replaced by the Y-type structure, followed by an up-up-down (UUD) phase corresponding to the 1/3 magnetization plateau. In contrast, when the field is applied within the triangular plane, the system evolves into a canted Y state at a higher critical field. These results reveal that weak anisotropy, though small in magnitude, exerts a strongly orientation-dependent influence, playing a key role in selecting the field-induced phases in this frustrated magnet. |
| title | Directional selection of field-induced phases by weak anisotropy in triangular-lattice K$_2$Mn(SeO$_3$)$_2$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2604.12489 |