Ultrafast dynamics evidence of strong coupling superconductivity in LaH10±δ

Y. L. Wu, X. H. Yu, J. Z. L. Hasaien, Fang Hong (), P. F. Shan, Z. Y. Tian, Y. N. Zhai, J. P. Hu, J. G. Cheng () and Jimin Zhao ()
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Y. L. Wu: Chinese Academy of Sciences
X. H. Yu: Chinese Academy of Sciences
J. Z. L. Hasaien: Chinese Academy of Sciences
Fang Hong: Chinese Academy of Sciences
P. F. Shan: Chinese Academy of Sciences
Z. Y. Tian: Chinese Academy of Sciences
Y. N. Zhai: Chinese Academy of Sciences
J. P. Hu: Chinese Academy of Sciences
J. G. Cheng: Chinese Academy of Sciences
Jimin Zhao: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Recently, tremendous research interest has been aroused in clathrate superhydrides. However, their microscopic properties, especially the superconducting (SC) gap and electron-phonon coupling (EPC) strength, are largely unexplored experimentally. Here, we investigate the time-resolved ultrafast spectroscopy of a superconductor LaH10±δ under an ultrahigh pressure of 165 GPa. By analyzing the ultrafast dynamics of the quasiparticles, we experimentally obtain the SC gap Δ(0) = 53 ± 5 meV, revealing a gap ratio 2Δ(0)/kBTc = 5.6 and a gap parameter ϑ = 1.95. Significantly, we experimentally estimate $$\lambda \langle {\Omega }^{2}\rangle$$ λ ⟨ Ω 2 ⟩ = (2.4 ± 0.1) × 104 (meV)2, which corresponds to an EPC strength λ = 2.58 ± 0.11. These results together provide direct experimental evidence that strong EPC is responsible for the near-room-temperature superconductivity in clathrate superhydrides. Our investigation significantly advances the experimental exploration of superhydrides, and contributes to the ultrafast dynamics investigations of quantum materials under high pressures.

Date: 2024
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DOI: 10.1038/s41467-024-53103-w

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