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| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2604.02114 |
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| _version_ | 1866910097682202624 |
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| author | Liu, Yi Xu, Chen-Chao Bao, Jin-Ke Lv, Bai-Jiang Li, Hao Li, Jing Lin, Yi-Qiang Li, Hua-Xun Lu, Yi-Ming Zhao, Xin-Yu Yang, Wu-Zhang Zhang, Zhen-Yi Chen, Xian-Yan Jiao, Wen-he Liu, Ji-Yong Zhu, Bai-Ren Cao, Guang-Han |
| author_facet | Liu, Yi Xu, Chen-Chao Bao, Jin-Ke Lv, Bai-Jiang Li, Hao Li, Jing Lin, Yi-Qiang Li, Hua-Xun Lu, Yi-Ming Zhao, Xin-Yu Yang, Wu-Zhang Zhang, Zhen-Yi Chen, Xian-Yan Jiao, Wen-he Liu, Ji-Yong Zhu, Bai-Ren Cao, Guang-Han |
| contents | Metal-to-insulator transitions (MITs), particularly near room temperature, have been extensively studied in nonmagnetic and conventional ferromagnetic and antiferromagnetic systems, yet the co-emergence of MIT and altermagnetism (AM) remains unexplored. Here, a layered chromium-based compound CsCr$_2$S$_2$O that realizes this coexistence was synthesized. It crystalizes in CeCr$_2$Si$_2$C-type structure with Cr moments orders in a C-type antiferromagnetic configuration below $T_\mathrm{N}$ = 326 K, constituting a room-temperature d-wave altermagnet. In the altermagnetic state, a subsequent Verwey-type MIT appears at $T_\mathrm{MI}$ = 305 K, driven by a tetragonal-to-orthorhombic structural distortion and stripe charge ordering of Cr$^{+2}$/Cr$^{+3}$ ions, while maintaining its altermagnetic character. First-principles calculations show moment-dependent spin-split electronic structures with maximum splitting energies of ~0.6 eV and ~0.3 eV in the metallic and insulating states, respectively. Our work links the two prominent phenomena, MIT and AM, in a single material, establishing a new platform for potential spintronic applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_02114 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Altermagnetism and Room-Temperature Metal-to-Insulator Transition in CsCr$_2$S$_2$O Liu, Yi Xu, Chen-Chao Bao, Jin-Ke Lv, Bai-Jiang Li, Hao Li, Jing Lin, Yi-Qiang Li, Hua-Xun Lu, Yi-Ming Zhao, Xin-Yu Yang, Wu-Zhang Zhang, Zhen-Yi Chen, Xian-Yan Jiao, Wen-he Liu, Ji-Yong Zhu, Bai-Ren Cao, Guang-Han Materials Science Strongly Correlated Electrons Metal-to-insulator transitions (MITs), particularly near room temperature, have been extensively studied in nonmagnetic and conventional ferromagnetic and antiferromagnetic systems, yet the co-emergence of MIT and altermagnetism (AM) remains unexplored. Here, a layered chromium-based compound CsCr$_2$S$_2$O that realizes this coexistence was synthesized. It crystalizes in CeCr$_2$Si$_2$C-type structure with Cr moments orders in a C-type antiferromagnetic configuration below $T_\mathrm{N}$ = 326 K, constituting a room-temperature d-wave altermagnet. In the altermagnetic state, a subsequent Verwey-type MIT appears at $T_\mathrm{MI}$ = 305 K, driven by a tetragonal-to-orthorhombic structural distortion and stripe charge ordering of Cr$^{+2}$/Cr$^{+3}$ ions, while maintaining its altermagnetic character. First-principles calculations show moment-dependent spin-split electronic structures with maximum splitting energies of ~0.6 eV and ~0.3 eV in the metallic and insulating states, respectively. Our work links the two prominent phenomena, MIT and AM, in a single material, establishing a new platform for potential spintronic applications. |
| title | Altermagnetism and Room-Temperature Metal-to-Insulator Transition in CsCr$_2$S$_2$O |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2604.02114 |