Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010njph...12l3003g&link_type=abstract
New Journal of Physics, Volume 12, Issue 12, pp. 123003 (2010).
Physics
1
Scientific paper
We report an investigation of the distinct quasiparticle (QP) relaxation dynamics in an electron-doped superconductor, BaFe1.9Ni0.1As2, employing femtosecond pump-probe measurements. Two distinct relaxation components and one sub-nanosecond long-lived component are clearly observed in our transient reflectivity spectra. The slow relaxation component, which is on a picosecond time scale, strongly correlates with the superconducting (SC) transition, and we attribute it to the recombination dynamics of Cooper pairs. We calculated the SC gap, Δ(0)≈5.7 meV. The fast relaxation component, on a sub-picosecond scale, is ascribed to the QP relaxation from a range of large gap states to the state above the SC gap. We obtained the low end of these bandgaps to be ΔG≈9 meV. Furthermore, we estimated the electron-phonon (e-ph) coupling constant and the Coulomb pseudopotential from the fast relaxation lifetime. The small values of the e-ph constant and the negative Coulomb pseudopotential suggest that the e-ph interaction is not the dominant contribution of the SC transition.
Cao G.-H.
Gong Yiyang
Lai Weidong
Li Lain-Jong
Nosach T.
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