Pressure-Induced Metal-Insulator and Paramagnet-Altermagnet Transitions in Rutile OsO2 Single Crystals
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arXiv
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| Natura: | Preprint |
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2026
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| author | Zhao, Guojian Meng, Ziang Huang, Wencheng Qin, Peixin Ruan, Shaoheng Ma, Liang Zhu, Lin He, Yuzhou Liu, Li Duan, Zhiyuan Wang, Xiaoning Chen, Hongyu Jiang, Sixu Li, Jingyu Tan, Xiaoyang Ozawa, K. Wang, Bosen Cheng, Jinguang Zhang, Qinghua Wang, Jianfeng Chen, Chaoyu Liu, Zhiqi |
| author_facet | Zhao, Guojian Meng, Ziang Huang, Wencheng Qin, Peixin Ruan, Shaoheng Ma, Liang Zhu, Lin He, Yuzhou Liu, Li Duan, Zhiyuan Wang, Xiaoning Chen, Hongyu Jiang, Sixu Li, Jingyu Tan, Xiaoyang Ozawa, K. Wang, Bosen Cheng, Jinguang Zhang, Qinghua Wang, Jianfeng Chen, Chaoyu Liu, Zhiqi |
| contents | Altermagnets with compensated spin structures and nonrelativistic spin splitting have emerged as a new class of magnetic materials. Rutile OsO2 has been theoretically predicted to be altermagnetic, but experimental studies have been limited by synthesis challenges. We have succeeded in synthesizing high-quality single crystals of rutile OsO2. Electrical transport studies reveal that OsO2 is highly conductive and exhibits clear Fermi liquid behavior, indicating strong electron-electron scattering. Magnetic measurements show that the crystals are isotropically paramagnetic. Density-functional theory calculations indicate that bulk OsO2 is semimetallic with coexisting electron and hole pockets, with its magnetic ground state strongly dependent on the on-site Coulomb correlation U. Angle-resolved photoemission spectroscopy studies unveil that the bulk bands do not yet show altermagnetic spin splitting. Interestingly, resistivity is rather pressure sensitive: at 44 GPa, a clear metal-insulator transition occurs. Hybrid functional calculations reveal that applying pressure significantly increases the Hubbard U value, driving a phase transition from a paramagnetic metal to an altermagnetic metal, and eventually to an altermagnetic insulator. These findings suggest that tuning external pressure effectively modulates the magnetic ground state of OsO2, providing a pathway to realize altermagnetism in this material. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2603_07008 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Pressure-Induced Metal-Insulator and Paramagnet-Altermagnet Transitions in Rutile OsO2 Single Crystals Zhao, Guojian Meng, Ziang Huang, Wencheng Qin, Peixin Ruan, Shaoheng Ma, Liang Zhu, Lin He, Yuzhou Liu, Li Duan, Zhiyuan Wang, Xiaoning Chen, Hongyu Jiang, Sixu Li, Jingyu Tan, Xiaoyang Ozawa, K. Wang, Bosen Cheng, Jinguang Zhang, Qinghua Wang, Jianfeng Chen, Chaoyu Liu, Zhiqi Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons Applied Physics Altermagnets with compensated spin structures and nonrelativistic spin splitting have emerged as a new class of magnetic materials. Rutile OsO2 has been theoretically predicted to be altermagnetic, but experimental studies have been limited by synthesis challenges. We have succeeded in synthesizing high-quality single crystals of rutile OsO2. Electrical transport studies reveal that OsO2 is highly conductive and exhibits clear Fermi liquid behavior, indicating strong electron-electron scattering. Magnetic measurements show that the crystals are isotropically paramagnetic. Density-functional theory calculations indicate that bulk OsO2 is semimetallic with coexisting electron and hole pockets, with its magnetic ground state strongly dependent on the on-site Coulomb correlation U. Angle-resolved photoemission spectroscopy studies unveil that the bulk bands do not yet show altermagnetic spin splitting. Interestingly, resistivity is rather pressure sensitive: at 44 GPa, a clear metal-insulator transition occurs. Hybrid functional calculations reveal that applying pressure significantly increases the Hubbard U value, driving a phase transition from a paramagnetic metal to an altermagnetic metal, and eventually to an altermagnetic insulator. These findings suggest that tuning external pressure effectively modulates the magnetic ground state of OsO2, providing a pathway to realize altermagnetism in this material. |
| title | Pressure-Induced Metal-Insulator and Paramagnet-Altermagnet Transitions in Rutile OsO2 Single Crystals |
| topic | Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons Applied Physics |
| url | https://arxiv.org/abs/2603.07008 |