Revealing the similarity to Ruddlesden-Popper nickelates and electron-phonon coupling in the infinite-layer nickelate superconductor (Sm0.69Ca0.05Eu0.26)NiO2 by pump-probe spectra
Qiong Wu, Mingwei Yang, Shuxiang Xu, Heng Wang, Hao Wang, Dong Wu, Tao Dong, Danfeng Li, Nanlin Wang
DOI 10.1103/j8v5-vl1c · Physical Review B
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Abstract
The recently discovered infinite-layer nickelate superconductor offers a new platform for exploring high-temperature superconductivity. In this work, we employ time-resolved ultrafast optical spectroscopy to investigate the excited carrier dynamics in Eu-doped (Sm0.69Ca0.05Eu0.26)NiO2 thin film, which exhibits superconductivity with Tc0=16K. The formation of superconducting gap was identified with estimating the gap size of about 2.5 meV, which can be eliminated with a small pump fluence of 0.32μJ/cm2. The relaxation trajectories of quasiparticles exhibit a high similarity to those of the Ruddlesden-Popper nickelates, supporting the commonality in their electronic structures and superconductivity. More interestingly, from the temperature dependence of fast component, we estimate an electron-phonon coupling (EPC) strength of ≈0.42, which would predict a transition temperature of only 3.5 K. This suggests that EPC alone is insufficient to explain superconductivity in the RNiO2 system, and there must be other interactions that help hold Cooper pairs together.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Sm0.69Ca0.05Eu0.26)NiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16 | Pressure not reported | zero_resistance |
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