Journal
CHINESE PHYSICS LETTERS
Volume 37, Issue 9, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0256-307X/37/9/097802
Keywords
78; 47; J-; 78; 47; jg; 71; 38; -k; 74; 70; -b
Categories
Funding
- National Key Research and Development Program of China [2017YFA0303603, 2016YFA0300300]
- National Natural Science Foundation of China [11574383, 11774408, 11574370]
- Frontier Program of the Chinese Academy of Sciences [QYZDY-SSW-SLH001]
- Strategic Priority Research Program of CAS [XDB30000000]
- Beijing Natural Science Foundation [4191003]
- International Partnership Program of Chinese Academy of Sciences [GJHZ1826]
- CAS Interdisciplinary Innovation Team
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Distinctive superconducting behaviors between bulk and monolayer FeSe make it challenging to obtain a unified picture of all FeSe-based superconductors. We investigate the ultrafast quasiparticle (QP) dynamics of an intercalated superconductor (Li1 -x Fex )OHFe1 -y Se, which is a bulk crystal but shares a similar electronic structure with single-layer FeSe on SrTiO3 . We obtain the electron-phonon coupling (EPC) constant lambdaA1g (0.22 +/- 0.04), which well bridges that of bulk FeSe crystal and single-layer FeSe on SrTiO3 . Significantly, we find that such a positive correlation between lambdaA1g and superconductingTc holds among all known FeSe-based superconductors, even in line with reported FeAs-based superconductors. Our observation indicates possible universal role of EPC in the superconductivity of all known categories of iron-based superconductors, which is a critical step towards achieving a unified superconducting mechanism for all iron-based superconductors.
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