Electronic Origin of Ferromagnetic Excitations in the Candidate Spin-Triplet Superconductor CeSb2
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arXiv
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866916061612343296 |
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| author | Wang, Xiaoxiao Chen, Xiaoyang Sangphet, Suppanut Fang, Yifei Wang, Yilin Li, Chihao Lei, Minyinan Guo, Nan Song, Yuanhe Peng, Rui Xu, Haichao Feng, Donglai |
| author_facet | Wang, Xiaoxiao Chen, Xiaoyang Sangphet, Suppanut Fang, Yifei Wang, Yilin Li, Chihao Lei, Minyinan Guo, Nan Song, Yuanhe Peng, Rui Xu, Haichao Feng, Donglai |
| contents | The origin of quasi-one-dimensional (q1D) ferromagnetic (FM) excitations in the candidate spin-triplet superconductor CeSb$_2$ has remained unclear. Here we report an electronic mechanism for emergent q1D magnetism in the quasi-two-dimensional lattice of CeSb$_2$, revealed by angle-resolved photoemission spectroscopy (ARPES). High-resolution ARPES resolves no spin-density-wave gap on the dispersive Fermi pockets, disfavoring a nesting-driven mechanism for the q1D FM excitations. Instead, resonant ARPES reveals a pronounced selective enhancement of Ce 4$f$ spectral weight on the $C_2$-distributed Fermi pockets aligned with the Ce ladder. This observation signifies band-selective Kondo coupling that generates strongly anisotropic magnetic exchange interactions, which can naturally account for both the q1D ferromagnetic excitations and the competing magnetic orders. Our results identify a band-selective Kondo coupling mechanism for emergent low-dimensional magnetism in correlated $f$-electron systems. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_30074 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Electronic Origin of Ferromagnetic Excitations in the Candidate Spin-Triplet Superconductor CeSb2 Wang, Xiaoxiao Chen, Xiaoyang Sangphet, Suppanut Fang, Yifei Wang, Yilin Li, Chihao Lei, Minyinan Guo, Nan Song, Yuanhe Peng, Rui Xu, Haichao Feng, Donglai Strongly Correlated Electrons Superconductivity The origin of quasi-one-dimensional (q1D) ferromagnetic (FM) excitations in the candidate spin-triplet superconductor CeSb$_2$ has remained unclear. Here we report an electronic mechanism for emergent q1D magnetism in the quasi-two-dimensional lattice of CeSb$_2$, revealed by angle-resolved photoemission spectroscopy (ARPES). High-resolution ARPES resolves no spin-density-wave gap on the dispersive Fermi pockets, disfavoring a nesting-driven mechanism for the q1D FM excitations. Instead, resonant ARPES reveals a pronounced selective enhancement of Ce 4$f$ spectral weight on the $C_2$-distributed Fermi pockets aligned with the Ce ladder. This observation signifies band-selective Kondo coupling that generates strongly anisotropic magnetic exchange interactions, which can naturally account for both the q1D ferromagnetic excitations and the competing magnetic orders. Our results identify a band-selective Kondo coupling mechanism for emergent low-dimensional magnetism in correlated $f$-electron systems. |
| title | Electronic Origin of Ferromagnetic Excitations in the Candidate Spin-Triplet Superconductor CeSb2 |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2605.30074 |