Neutron Spin Resonance in a Quasi-Two-Dimensional Iron-Based Superconductor
Wenshan Hong, Linxing Song, Bo Liu, Zezong Li, Zhenyuan Zeng, Yang Li, Dingsong Wu, Qiangtao Sui, Tao Xie, Sergey Danilkin, Haranath Ghosh, Abyay Ghosh, Jiangping Hu, Lin Zhao, Xingjiang Zhou, Xianggang Qiu, Shiliang Li, Huiqian Luo
DOI 10.1103/PhysRevLett.125.117002 · Physical Review Letters
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The neutron spin resonance is generally regarded as a key to understanding the magnetically mediated Cooper pairing in unconventional superconductors. Here, we report an inelastic neutron scattering study on the low-energy spin excitations in a quasi-two-dimensional iron-based superconductor KCa2Fe4As4F2. We have discovered a two-dimensional spin resonant mode with downward dispersions, a behavior closely resembling the low branch of the hourglass-type spin resonance in cuprates. While the resonant intensity is predominant by two broad incommensurate peaks near Q=(0.5,0.5) with a sharp energy peak at ER=16 meV, the overall energy dispersion of the mode exceeds the measured maximum total gap Δtot=|Δk|+|Δk+Q|. These results deeply challenge the conventional understanding of the resonance modes as magnetic excitons regardless of underlining pairing symmetry schemes, and it also points out that when the iron-based superconductivity becomes very quasi-two-dimensional, the electronic behaviors are similar to those in cuprates.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| KCa2Fe4As4F2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 33.5 | Pressure not reported | onset |
| CsCa2Fe4As4F2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28.9 | Pressure not reported | unknown |
Similar papers
Single-particle tunneling spectroscopy and superconducting gaps in the layered iron-based superconductor KCa2Fe4As4F2
similarity 0.94Wen Duan et al.
Source status unknown — claims are unverified
Inelastic Neutron-Scattering Measurements of a Three-Dimensional Spin Resonance in the FeAs-Based BaFe1.9Ni0.1As2 Superconductor
similarity 0.93Songxue Chi et al.
Source status unknown — claims are unverified
Nodal multigap superconductivity in KCa2Fe4As4F2
similarity 0.92M. Smidman et al.
Source status unknown — claims are unverified
Multiband superconductivity and a deep gap minimum from the specific heat in KCa2(Fe1−xNix)4As4F2 (x=0, 0.05, 0.13)
similarity 0.92Yiwen Li et al.
Source status unknown — claims are unverified
Electron-doping evolution of the low-energy spin excitations in the iron arsenide superconductor BaFe2−xNixAs2
similarity 0.92Miaoyin Wang et al.
Source status unknown — claims are unverified
Crossover from weak to strong pairing in unconventional superconductors
similarity 0.92D. S. Inosov et al.
Source status unknown — claims are unverified