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Distinctive superconducting behaviors between bulk and monolayer FeSe make itchallenging to obtain a unified picture of all FeSe-based superconductors. Weinvestigate the ultrafast quasiparticle (QP) dynamics of an intercalatedsuperconductor (Li1-xFex)OHFe1-ySe, which is a bulk crystal but shares asimilar electronic structure with single-layer FeSe on SrTiO3. We obtain theelectron-phonon coupling (EPC) constant {\lambda}A1g (0.22 +/- 0.04), whichwell bridges that of bulk FeSe crystal and single-layer FeSe on SrTiO3.Moreover, we find that such a positive correlation between {\lambda}A1g andsuperconducting Tc holds among all known FeSe-based superconductors, even inline with reported FeAs-based superconductors. Our observation indicatespossible universal role of EPC in the superconductivity of all known categoriesof iron-based superconductors, which is a critical step towards achieving aunified superconducting mechanism for all iron-based superconductors.

Ultrafast Quasiparticle Dynamics and Electron-Phonon Coupling in (Li0.84Fe0.16)OHFe0.98Se