Interplay of electron-phonon coupling, pseudogap, and superconductivity in CsCa2Fe4As4F2 studied using ultrafast optical spectroscopy
Qi-Yi Wu, Chen Zhang, Bai-Zhuo Li, Hao Liu, Jiao-Jiao Song, Bo Chen, Hai-Yun Liu, Yu-Xia Duan, Jun He, Jun Liu, Guang-Han Cao, Jian-Qiao Meng
DOI 10.1103/PhysRevB.111.L081110 · Physical Review B
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Abstract
The quasiparticle relaxation dynamics of the iron-based superconductor CsCa2Fe4As4F2 (Tc∼29 K) were investigated using ultrafast optical spectroscopy. A pseudogap (ΔPG=3.3±0.3 meV) was observed to open below T*≈60 K, prior to the emergence of a superconducting gap [Δ(0)=6.6±0.4 meV]. At high excitation fluence, a coherent A1g phonon mode at 5.49 THz was identified, exhibiting deviations from anharmonic behavior below Tc. The electron-phonon coupling constant for this mode was estimated to be λA1g≈0.23. These results provide insights into the interplay between the electron-phonon interactions, pseudogap, and the superconducting pairing mechanism in CsCa2Fe4As4F2.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CsCa2Fe4As4F2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 29 | Pressure not reported | onset |
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