Electronic Origin of Ferromagnetic Excitations in the Candidate Spin-Triplet Superconductor CeSb2
Abstract
The origin of quasi-one-dimensional (q1D) ferromagnetic (FM) excitations in the candidate spin-triplet superconductor CeSb has remained unclear. Here we report an electronic mechanism for emergent q1D magnetism in the quasi-two-dimensional lattice of CeSb, 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 spectral weight on the -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 -electron systems.
Cite
@article{arxiv.2605.30074,
title = {Electronic Origin of Ferromagnetic Excitations in the Candidate Spin-Triplet Superconductor CeSb2},
author = {Xiaoxiao Wang and Xiaoyang Chen and Suppanut Sangphet and Yifei Fang and Yilin Wang and Chihao Li and Minyinan Lei and Nan Guo and Yuanhe Song and Rui Peng and Haichao Xu and Donglai Feng},
journal= {arXiv preprint arXiv:2605.30074},
year = {2026}
}