Possible Spin Triplet Pairing due to Altermagnetic Spin Fluctuation
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866912584642330624 |
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| author | Ma, Xin Wu, Siqi Li, Zilong Hu, Lunhui Dai, Jianhui Cao, Chao |
| author_facet | Ma, Xin Wu, Siqi Li, Zilong Hu, Lunhui Dai, Jianhui Cao, Chao |
| contents | The interplay between unconventional superconductivity and altermagnetic order has attracted much attentions. In particular, whether spin-triplet superconductivity can be achieved by suppressing altermagnetism remains an open issue. We investigate this issue using a minimal single-orbital Hubbard model on a square lattice with vacancy superstructure, in which both conventional antiferromagnetic and altermagnetic order can emerge on equal footing. We illustrate the existence of a metallic normal phase with altermagnetism even at half-filling due to the geometric frustration and Coulomb interaction. Suppressing the altermagnetic long-range order using charge doping can lead to both conventional antiferromagnetic and altermagnetic spin fluctuation. The spin-singlet pairing is always favored when the conventional antiferromagnetic spin fluctuation dominates. However, when the altermagnetic spin fluctuation dominates, spin-triplet pairing may be induced. Implications of our results in possible material candidates are also briefly discussed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_09959 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Possible Spin Triplet Pairing due to Altermagnetic Spin Fluctuation Ma, Xin Wu, Siqi Li, Zilong Hu, Lunhui Dai, Jianhui Cao, Chao Superconductivity The interplay between unconventional superconductivity and altermagnetic order has attracted much attentions. In particular, whether spin-triplet superconductivity can be achieved by suppressing altermagnetism remains an open issue. We investigate this issue using a minimal single-orbital Hubbard model on a square lattice with vacancy superstructure, in which both conventional antiferromagnetic and altermagnetic order can emerge on equal footing. We illustrate the existence of a metallic normal phase with altermagnetism even at half-filling due to the geometric frustration and Coulomb interaction. Suppressing the altermagnetic long-range order using charge doping can lead to both conventional antiferromagnetic and altermagnetic spin fluctuation. The spin-singlet pairing is always favored when the conventional antiferromagnetic spin fluctuation dominates. However, when the altermagnetic spin fluctuation dominates, spin-triplet pairing may be induced. Implications of our results in possible material candidates are also briefly discussed. |
| title | Possible Spin Triplet Pairing due to Altermagnetic Spin Fluctuation |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2509.09959 |