Pressure-Induced Superconducting-like Transition in the $\it d$-wave Altermagnet Candidate CsV$_2$Se$_2$O
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866911582616813568 |
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| author | Li, Yuanzhe Han, Yilin Yang, Liu He, Wanli Ye, Pengda Huang, Wencheng Qiao, Jiabin Li, Yuemei Sun, Xiaodong He, Tingli Han, Jiayi Chen, Yuxiang Tian, Ruifeng Sun, Hao Liu, Yuwei Wu, Feng Song, Baoshan Liu, Zhengtai Ye, Mao Huang, Yaobo Ozawa, Kenichi Dai, Ji Tallarida, Massimo Cui, Shengtao Chen, Jie Jin, Meiling Zheng, Wayne Chen, Chaoyu Wang, Zhiwei Yu, Zhi-Ming Li, Xiang Yao, Yugui |
| author_facet | Li, Yuanzhe Han, Yilin Yang, Liu He, Wanli Ye, Pengda Huang, Wencheng Qiao, Jiabin Li, Yuemei Sun, Xiaodong He, Tingli Han, Jiayi Chen, Yuxiang Tian, Ruifeng Sun, Hao Liu, Yuwei Wu, Feng Song, Baoshan Liu, Zhengtai Ye, Mao Huang, Yaobo Ozawa, Kenichi Dai, Ji Tallarida, Massimo Cui, Shengtao Chen, Jie Jin, Meiling Zheng, Wayne Chen, Chaoyu Wang, Zhiwei Yu, Zhi-Ming Li, Xiang Yao, Yugui |
| contents | Altermagnetism generates exchange-type spin splitting without net magnetization and, in its $\it d$-wave form, resembles the angular symmetry of unconventional $\it d$-wave superconductivity. Whether this correspondence bears directly on superconducting instabilities in real correlated materials remains open. Here we study the quasi-two-dimensional vanadium oxychalcogenide CsV$_2$Se$_2$O (CVSO), a square-net $\it d$-wave altermagnet candidate, through combined experimental and theoretical investigation of its lattice structure, electronic structure and transport properties. At ambient pressure, CVSO is a weakly insulating parent state with a density-wave-like anomaly near 100 K, and its bulk properties are most consistent with a G-type compensated antiferromagnetic background. Under compression, the density-wave-like feature is suppressed, the magnetoresistance evolves from predominantly negative to positive, and a superconducting-like resistive downturn emerges below about 3 K. This low-temperature anomaly is reproducible across samples and pressure media, and is suppressed by magnetic field. Room-temperature X-ray diffraction reveals no symmetry lowering, whereas does show a pronounced compressibility anomaly over the same pressure range. CVSO thus reveals a pressure-tuned phase diagram in which a reconstructed weakly insulating parent state gives way to strange-metal-like transport and superconducting-like behavior, echoing broader phenomenology associated with unconventional superconductors, including cuprates and nickelates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_09457 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Pressure-Induced Superconducting-like Transition in the $\it d$-wave Altermagnet Candidate CsV$_2$Se$_2$O Li, Yuanzhe Han, Yilin Yang, Liu He, Wanli Ye, Pengda Huang, Wencheng Qiao, Jiabin Li, Yuemei Sun, Xiaodong He, Tingli Han, Jiayi Chen, Yuxiang Tian, Ruifeng Sun, Hao Liu, Yuwei Wu, Feng Song, Baoshan Liu, Zhengtai Ye, Mao Huang, Yaobo Ozawa, Kenichi Dai, Ji Tallarida, Massimo Cui, Shengtao Chen, Jie Jin, Meiling Zheng, Wayne Chen, Chaoyu Wang, Zhiwei Yu, Zhi-Ming Li, Xiang Yao, Yugui Superconductivity Materials Science Strongly Correlated Electrons Altermagnetism generates exchange-type spin splitting without net magnetization and, in its $\it d$-wave form, resembles the angular symmetry of unconventional $\it d$-wave superconductivity. Whether this correspondence bears directly on superconducting instabilities in real correlated materials remains open. Here we study the quasi-two-dimensional vanadium oxychalcogenide CsV$_2$Se$_2$O (CVSO), a square-net $\it d$-wave altermagnet candidate, through combined experimental and theoretical investigation of its lattice structure, electronic structure and transport properties. At ambient pressure, CVSO is a weakly insulating parent state with a density-wave-like anomaly near 100 K, and its bulk properties are most consistent with a G-type compensated antiferromagnetic background. Under compression, the density-wave-like feature is suppressed, the magnetoresistance evolves from predominantly negative to positive, and a superconducting-like resistive downturn emerges below about 3 K. This low-temperature anomaly is reproducible across samples and pressure media, and is suppressed by magnetic field. Room-temperature X-ray diffraction reveals no symmetry lowering, whereas does show a pronounced compressibility anomaly over the same pressure range. CVSO thus reveals a pressure-tuned phase diagram in which a reconstructed weakly insulating parent state gives way to strange-metal-like transport and superconducting-like behavior, echoing broader phenomenology associated with unconventional superconductors, including cuprates and nickelates. |
| title | Pressure-Induced Superconducting-like Transition in the $\it d$-wave Altermagnet Candidate CsV$_2$Se$_2$O |
| topic | Superconductivity Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2604.09457 |