Ze-Zhong Li

Chinese Academy of Sciences

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Huiqian Luo

Chinese Academy of Sciences

Jun He

Central South University

Jianqiao Meng

Central South University

Xue-Qing Ye

Central South University

Yu-Xia Duan

Central South University

Hao Liu

Central South University

Jiao-Jiao Song

Central South University

Bo Chen

Central South University

Yahua Yuan

Central South University

Shiliang Li

National Laboratory for Superconductivity

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Songshan Lake Materials Laboratory

Institute of Physics

Central South University

Peking University

Chinese Academy of Sciences

University of Chinese Academy of Sciences

National Laboratory for Superconductivity

Czech Academy of Sciences, Institute of Physics

Beijing Academy of Quantum Information Sciences

National Astronomical Observatories

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The Hidden Nematic Fluctuations in the Triclinic (Ca0.85La0.15)10(Pt3As8)(Fe2As2)5 Superconductor Revealed by Ultrafast Optical Spectroscopy

arXiv (Cornell University) (2023)

Qi-Yi Wu Chen Zhang Ze-Zhong Li Wenshan Hong Hao Liu

We reported the quasiparticle relaxation dynamics of an optimally doped triclinic iron-based superconductor (Ca$_{0.85}$La$_{0.15}$)$_{10}$(Pt$_3$As$_8$)(Fe$_2$As$_2$)$_5$ with bulk $T_c$ = 30 K using polarized ultrafast optical pump-probe spectroscopy. Our results reveal anisotropic transient reflectivity induced by nematic fluctuations develops below $T_{nem}$ $\approx$ 120 K and persists in the superconducting states. Measurements under high pump fluence reveal three distinct, coherent phonon modes at frequencies of 1.6, 3.5, and 4.7 THz, corresponding to $A_{1g}(1)$, $E_g$, and $A_{1g}(2)$ modes, respectively. The high-frequency $A_{1g}(2)$ mode corresponds to the $c$-axis polarized vibrations of FeAs planes with a nominal electron-phonon coupling constant $\lambda _{A_{1g}(2)}$ $\approx$ 0.139 $\pm$ 0.02. Our findings suggest that the superconductivity and nematic state are compatible but competitive at low temperatures, and the $A_{1g}$ phonons play an important role in the formation of Cooper pairs in (Ca$_{0.85}$La$_{0.15}$)$_{10}$(Pt$_3$As$_8$)(Fe$_2$As$_2$)$_5$.

Triclinic crystal system

10.48550/arxiv.2305.18763

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Hidden nematic fluctuation in the triclinic (Ca0.85La0.15)10(Pt3As8

Physical review. B./Physical review. B (2023)

Qi-Yi Wu Chen Zhang Ze-Zhong Li Wenshan Hong Hao Liu

We reported the quasiparticle relaxation dynamics of an optimally doped triclinic iron-based superconductor ${({\mathrm{Ca}}_{0.85}{\mathrm{La}}_{0.15})}_{10}({\mathrm{Pt}}_{3}{\mathrm{As}}_{8}){({\mathrm{Fe}}_{2}{\mathrm{As}}_{2})}_{5}$ with bulk ${T}_{c}=30\phantom{\rule{0.28em}{0ex}}\mathrm{K}$ using polarized ultrafast optical pump-probe spectroscopy. Our results reveal anisotropic transient reflectivity induced by nematic fluctuations develops below ${T}_{\text{nem}}\ensuremath{\approx}120$ K and persists in the superconducting states. Measurements under high pump fluence reveal three distinct, coherent phonon modes at frequencies of 1.6, 3.5, and 4.7 THz, corresponding to ${A}_{1g}(1), {E}_{g}$, and ${A}_{1g}(2)$ modes, respectively. The high-frequency ${A}_{1g}(2)$ mode corresponds to the $c$-axis polarized vibrations of FeAs planes with a nominal electron-phonon coupling constant ${\ensuremath{\lambda}}_{{A}_{1g}(2)}=0.139\ifmmode\pm\else\textpm\fi{}0.02$. Our results suggest that, at low temperatures, superconducting and nematic states coexist but compete with each other, and it is possible that ${A}_{1g}$ phonons are implicated in the formation of Cooper pairs in ${({\mathrm{Ca}}_{0.85}{\mathrm{La}}_{0.15})}_{10}({\mathrm{Pt}}_{3}{\mathrm{As}}_{8}){({\mathrm{Fe}}_{2}{\mathrm{As}}_{2})}_{5}$.

Triclinic crystal system

10.1103/physrevb.108.205136

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