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- W3199812164 abstract "We use ultrafast optical spectroscopy to study the nonequilibrium quasiparticle relaxation dynamics of the iron-based superconductor KCa$_2$Fe$_4$As$_4$F$_2$ with $T_c=33.5$ K. Our results reveal a possible pseudogap ($Delta_{PG}$ = 2.4 $pm$ 0.1 meV) below $T^*approx 50$ K but prior to the opening of a superconducting gap ($Delta_{SC}$(0) $approx$ 4.3 $pm$ 0.1 meV). Measurements under high pump fluence real two distinct, coherent phonon oscillations with 1.95 and 5.51 THz frequencies, respectively. The high-frequency $A_{1g}$(2) mode corresponds to the $c-$axis polarized vibrations of FeAs planes with a nominal electron-phonon coupling constant $lambda_{A_{1g}(2)}$ = 0.194 $pm$ 0.02. Our findings suggest that the pseudogap is likely a precursor of superconductivity, and the electron-phonon coupling may play an essential role in the superconducting pairing in KCa$_2$Fe$_4$As$_4$F$_2$." @default.
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- W3199812164 date "2022-01-20" @default.
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- W3199812164 title "Ultrafast optical spectroscopy evidence of pseudogap and electron-phonon coupling in an iron-based superconductor KCa2Fe4As4F2" @default.
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- W3199812164 doi "https://doi.org/10.1007/s11433-021-1830-9" @default.
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