Hidden nematic fluctuation in the triclinic (Ca0.85La0.15)10(Pt3As8)(Fe2As2)5 superconductor revealed by ultrafast optical spectroscopy
Qi-Yi Wu, Chen Zhang, Ze-Zhong Li, Wen-Shan Hong, Hao Liu, Jiao-Jiao Song, Yin-Zou Zhao, Ya-Hua Yuan, Bo Chen, Xue-Qing Ye, Shiliang Li, Jun He, H. Y. Liu, Yu-Xia Duan, Hui-Qian Luo, Jian-Qiao Meng
DOI 10.1103/PhysRevB.108.205136 · Physical Review B
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Abstract
We reported the quasiparticle relaxation dynamics of an optimally doped triclinic iron-based superconductor (Ca0.85La0.15)10(Pt3As8)(Fe2As2)5 with bulk Tc=30K using polarized ultrafast optical pump-probe spectroscopy. Our results reveal anisotropic transient reflectivity induced by nematic fluctuations develops below Tnem≈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 A1g(1), Eg, and A1g(2) modes, respectively. The high-frequency A1g(2) mode corresponds to the c-axis polarized vibrations of FeAs planes with a nominal electron-phonon coupling constant λA1g(2)=0.139±0.02. Our results suggest that, at low temperatures, superconducting and nematic states coexist but compete with each other, and it is possible that A1g phonons are implicated in the formation of Cooper pairs in (Ca0.85La0.15)10(Pt3As8)(Fe2As2)5.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Ca0.85La0.15)10(Pt3As8)(Fe2As2)5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
| (Ca0.85La0.15)10(Pt3As8)(Fe2As2)5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
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