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arXiv · 2509.09959

Spin triplet pairing by suppressing altermagnetism

Xin Ma·Siqi Wu·Zilong Li·Lunhui Hu·Jianhui Dai·Chao Cao
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Abstract

The interplay between unconventional superconductivity and altermagnetic order has attracted much attention. 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 a vacancy superstructure, in which both conventional antiferromagnetic and altermagnetic orders can emerge on an equal footing. We illustrate the existence of a metallic normal phase with altermagnetism even at half-filling due to geometric frustration and Coulomb interaction. Suppressing the altermagnetic long-range order using charge doping can lead to both conventional antiferromagnetic and altermagnetic spin fluctuations. Spin-singlet pairing is always favored when conventional antiferromagnetic spin fluctuations dominate. However, when altermagnetic spin fluctuations dominate, spin-triplet pairing will be induced. Implications of our results for possible material candidates are also briefly discussed.

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Xin Ma, Siqi Wu, Zilong Li, Lunhui Hu, Jianhui Dai, Chao Cao. 2025-09-12. Spin triplet pairing by suppressing altermagnetism. https://doi.org/10.1103/gkrn-pbjb

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