Interplay of electron-phonon coupling, pseudogap, and superconductivity in CsCa$_2$Fe$_4$As$_4$F$_2$ studied using ultrafast optical spectroscopy
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2024
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| _version_ | 1866910871183163392 |
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| author | Wu, Qi-Yi Zhang, Chen Li, Bai-Zhuo Liu, Hao Song, Jiao-Jiao Chen, Bo Liu, Hai-Yun Duan, Yu-Xia He, Jun Liu, Jun Cao, Guang-Han Meng, Jian-Qiao |
| author_facet | Wu, Qi-Yi Zhang, Chen Li, Bai-Zhuo Liu, Hao Song, Jiao-Jiao Chen, Bo Liu, Hai-Yun Duan, Yu-Xia He, Jun Liu, Jun Cao, Guang-Han Meng, Jian-Qiao |
| contents | The quasiparticle relaxation dynamics of the iron-based superconductor CsCa$_2$Fe$_4$As$_4$F$_2$ ($T_c$ $\sim$ 29 K) were investigated using ultrafast optical spectroscopy. A pseudogap ($Δ_{PG}$ $\approx$ 3.3 meV) was observed to open below $T^{\ast}$ $\approx$ 60 K, prior to the emergence of a superconducting gap ($Δ$ $\approx$ 6.6 $\pm$ 0.4 meV). At high excitation fluence, a coherent A1g phonon mode at 5.49 THz was identified, exhibiting deviations from anharmonic behavior below $T_c$. The electron-phonon coupling constant for this mode was estimated to be $λ_{A_{1g}}$ $\approx$ 0.23. These results provide insights into the interplay between the electron-phonon interactions, pseudogap, and the superconducting pairing mechanism in CsCa$_2$Fe$_4$As$_4$F$_2$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_16610 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Interplay of electron-phonon coupling, pseudogap, and superconductivity in CsCa$_2$Fe$_4$As$_4$F$_2$ studied using ultrafast optical spectroscopy Wu, Qi-Yi Zhang, Chen Li, Bai-Zhuo Liu, Hao Song, Jiao-Jiao Chen, Bo Liu, Hai-Yun Duan, Yu-Xia He, Jun Liu, Jun Cao, Guang-Han Meng, Jian-Qiao Superconductivity The quasiparticle relaxation dynamics of the iron-based superconductor CsCa$_2$Fe$_4$As$_4$F$_2$ ($T_c$ $\sim$ 29 K) were investigated using ultrafast optical spectroscopy. A pseudogap ($Δ_{PG}$ $\approx$ 3.3 meV) was observed to open below $T^{\ast}$ $\approx$ 60 K, prior to the emergence of a superconducting gap ($Δ$ $\approx$ 6.6 $\pm$ 0.4 meV). At high excitation fluence, a coherent A1g phonon mode at 5.49 THz was identified, exhibiting deviations from anharmonic behavior below $T_c$. The electron-phonon coupling constant for this mode was estimated to be $λ_{A_{1g}}$ $\approx$ 0.23. These results provide insights into the interplay between the electron-phonon interactions, pseudogap, and the superconducting pairing mechanism in CsCa$_2$Fe$_4$As$_4$F$_2$. |
| title | Interplay of electron-phonon coupling, pseudogap, and superconductivity in CsCa$_2$Fe$_4$As$_4$F$_2$ studied using ultrafast optical spectroscopy |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2410.16610 |