Emergent Ferromagnetic Ladder Excitations in Heavy Fermion Superconductor CeSb2
Zhaoyang Shan, Yangjie Jiao, Jiayu Guo, Yifan Wang, Jinyu Wu, Jiawen Zhang, Yanan Zhang, Dajun Su, Devashibhai T. Adroja, Christian Balz, Matthias Gutmann, Yu Liu, Huiqiu Yuan, Zhentao Wang, Yu Song, Michael Smidman
DOI 10.1103/PhysRevLett.134.116704 · Physical Review Letters
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Abstract
Low-dimensional spin fluctuations play a crucial role in unconventional superconductors, with quasi-one-dimensional spin excitations potentially linked with spin-triplet superconductivity. The heavy fermion superconductor CeSb2 exhibits an unusual large inverted S-shaped upper critical field that suggests a possible triplet pairing state within its pressure-induced superconducting dome. Using inelastic neutron scattering, we discover quasi-one-dimensional magnetic excitations in CeSb2 emerging from nearly square Ce layers with minor orthorhombic deformation. We show that the data are well described by a ferromagnetic spin ladder model, where the “rungs” of the ladder straddle Ce bilayers. Moreover, we find that diffuse excitations akin to those in the ordered phase persist well above TN, suggesting that quasi-one-dimensional ferromagnetic paramagnons may significantly contribute to the unusual superconductivity that appears under pressure once magnetic order is suppressed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeSb2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.22 | Pressure not reported | unknown |
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