Compression-induced magnetic obstructed atomic insulator and spin singlet state in antiferromagnetic KV2Se2O
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arXiv
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| Autori principali: | , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866909895450689536 |
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| author | Chen, Liucheng Yue, Jiayi Cheng, Jingwen Bai, Jianli Zhang, Zexiao Ma, Xiaoli Hong, Fang Chen, Genfu Wang, Jian-Tao Wang, Zhijun Yu, Xiaohui |
| author_facet | Chen, Liucheng Yue, Jiayi Cheng, Jingwen Bai, Jianli Zhang, Zexiao Ma, Xiaoli Hong, Fang Chen, Genfu Wang, Jian-Tao Wang, Zhijun Yu, Xiaohui |
| contents | Among the complex many-body systems, the metal-insulator transition stands out as a cornerstone and a particularly fertile ground for scientific inquiry. The established models including Mott insulator, Anderson localization and Peierls transition, are still insufficient to capture the complex and intertwined phenomena observed in certain material systems. KV2Se2O, a newly discovered room-temperature altermagnetic candidate exhibiting a spin-density-wave transition below 100 K, provides a unique platform to investigate the interplay of many-body effects and unconventional magnetism, specifically the anticipated metal-insulator transition under extreme conditions. Here, we report a compression-induced insulator by suppressing the metallic behavior without structural phase transition. The newly opened gap is estimated to be 40 meV at around 43.5 GPa, given direct evidence for the insulating state. A concurrent switching of carrier type demonstrates the large Fermi surface reconstruction crossing the metal-insulator transition. The density functional theory calculations indicate that the discovered V+2.5-based insulator is a magnetic obstructed atomic insulator, being a spin-singlet state with bonding orbital order. This work not only presents an archetype of a pressure-driven metal-insulator transition decoupled from structural change but also delivers fundamental physical insights into the metal-insulator transition. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_06712 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Compression-induced magnetic obstructed atomic insulator and spin singlet state in antiferromagnetic KV2Se2O Chen, Liucheng Yue, Jiayi Cheng, Jingwen Bai, Jianli Zhang, Zexiao Ma, Xiaoli Hong, Fang Chen, Genfu Wang, Jian-Tao Wang, Zhijun Yu, Xiaohui Strongly Correlated Electrons Among the complex many-body systems, the metal-insulator transition stands out as a cornerstone and a particularly fertile ground for scientific inquiry. The established models including Mott insulator, Anderson localization and Peierls transition, are still insufficient to capture the complex and intertwined phenomena observed in certain material systems. KV2Se2O, a newly discovered room-temperature altermagnetic candidate exhibiting a spin-density-wave transition below 100 K, provides a unique platform to investigate the interplay of many-body effects and unconventional magnetism, specifically the anticipated metal-insulator transition under extreme conditions. Here, we report a compression-induced insulator by suppressing the metallic behavior without structural phase transition. The newly opened gap is estimated to be 40 meV at around 43.5 GPa, given direct evidence for the insulating state. A concurrent switching of carrier type demonstrates the large Fermi surface reconstruction crossing the metal-insulator transition. The density functional theory calculations indicate that the discovered V+2.5-based insulator is a magnetic obstructed atomic insulator, being a spin-singlet state with bonding orbital order. This work not only presents an archetype of a pressure-driven metal-insulator transition decoupled from structural change but also delivers fundamental physical insights into the metal-insulator transition. |
| title | Compression-induced magnetic obstructed atomic insulator and spin singlet state in antiferromagnetic KV2Se2O |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2511.06712 |