Ultrafast dynamics evidence of strong coupling superconductivity in LaH_10±δ.

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 LaH_10±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)/k_BT_c = 5.6 and a gap parameter ϑ = 1.95. Significantly, we experimentally estimate λ⟨Ω2⟩  = (2.4 ± 0.1) × 10⁴ (meV)², which corresponds to an EPC strength λ = 2.58 ± 0.11. These results together provide direct experimental evi

SUBMITTER: Wu YL 

PROVIDER: S-EPMC11549371 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature