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

Abstract : 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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Submitted on : Monday, October 31, 2016 - 5:15:43 PM
Last modification on : Tuesday, July 16, 2019 - 9:02:07 AM

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A. Sterzi, A. Crepaldi, F. Cilento, G. Manzoni, E. Frantzeskakis, et al.. SmB6 electron-phonon coupling constant from time- and angle-resolved photoelectron spectroscopy. Physical Review B : Condensed matter and materials physics, American Physical Society, 2016, 94 (8), pp.081111. ⟨10.1103/PhysRevB.94.081111⟩. ⟨in2p3-01390122⟩

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