Determination of the electron-lattice coupling strength of copper with ultrafast MeV electron diffraction

Electron-lattice coupling strength governs the energy transfer between electrons and the lattice and is important for understanding the material behavior under highly non-equilibrium conditions. Here we report the results of employing time-resolved electron diffraction at MeV energies to directly st...

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Bibliographic Details
Published in:Review of scientific instruments 2018-10, Vol.89 (10), p.10C108-10C108
Main Authors: Mo, M. Z., Becker, V., Ofori-Okai, B. K., Shen, X., Chen, Z., Witte, B., Redmer, R., Li, R. K., Dunning, M., Weathersby, S. P., Wang, X. J., Glenzer, S. H.
Format: Article
Language:English
Subjects:
Computer simulation
Copper
Coupling
Debye-Waller factor
Electron diffraction
Electrons
Equilibrium conditions
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
MATERIALS SCIENCE
polycrystalline material
Relaxation time
Specific heat
Strength
Temperature dependence
thermodynamic properties
ultrafast lasers
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Summary:Electron-lattice coupling strength governs the energy transfer between electrons and the lattice and is important for understanding the material behavior under highly non-equilibrium conditions. Here we report the results of employing time-resolved electron diffraction at MeV energies to directly study the electron-lattice coupling strength in 40-nm-thick polycrystalline copper excited by femtosecond optical lasers. The temporal evolution of lattice temperature at various pump fluence conditions were obtained from the measurements of the Debye-Waller decay of multiple diffraction peaks. We observed the temperature dependence of the electron-lattice relaxation time which is a result of the temperature dependence of electron heat capacity. Comparison with two-temperature model simulations reveals an electron-lattice coupling strength of (0.9 ± 0.1) × 1017 W/m3/K for copper.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.5035368