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SmB6 electron-phonon coupling constant from time- and angle-resolved photoelectron spectroscopy

  • Sterzi, A.
  • Crepaldi, A.
  • Cilento, F.
  • Manzoni, G.
  • Frantzeskakis, E.
  • Zacchigna, M.
  • van Heumen, E.
  • Huang Y., K.
  • Golden M., S.
  • Parmigiani, F.
Publication Date
Aug 25, 2016
HAL-Paris 13
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SmB6 is a mixed valence Kondo system resulting from the hybridization between localized f electrons and delocalized d electrons. We have investigated its out-of-equilibrium electron dynamics by means of time- and angle-resolved photoelectron spectroscopy. The transient electronic population above the Fermi level can be described by a time-dependent Fermi-Dirac distribution. By solving a two-temperature model that well reproduces the relaxation dynamics of the effective electronic temperature, we estimate the electron-phonon coupling constant lambda to range from 0.13 +/- 0.03 to 0.04 +/- 0.01. These extremes are obtained assuming a coupling of the electrons with either a phonon mode at 10 or 19 meV. A realistic value of the average phonon energy will give an actual value of lambda within this range. Our results provide an experimental report on the material electron-phonon coupling, contributing to both the electronic transport and the macroscopic thermodynamic properties of SmB6.

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