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

Journal Article · · Review of Scientific Instruments
DOI: https://doi.org/10.1063/1.5035368 · OSTI ID:1490446
 [1];  [2]; ORCiD logo [1];  [1];  [1];  [3]; ORCiD logo [4]; ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Southern Illinois Univ., Edwardsville, IL (United States). Dept. of Physics
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States); Univ. of Rostock (Germany). Inst. of Physics
  4. Univ. of Rostock (Germany). Inst. of Physics
+ Show Author Affiliations

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. 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.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Univ. of Rostock (Germany)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES); German Research Foundation (DFG)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1490446
Alternate ID(s):
OSTI ID: 1471442
Journal Information:
Review of Scientific Instruments, Vol. 89, Issue 10; ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

References (14)

Electron-lattice energy relaxation in laser-excited thin-film Au-insulator heterostructures studied by ultrafast MeV electron diffraction journal September 2017
The Formation of Warm Dense Matter: Experimental Evidence for Electronic Bond Hardening in Gold journal February 2009
Single-shot mega-electronvolt ultrafast electron diffraction for structure dynamic studies of warm dense matter journal August 2016
Measurement of Electron-Ion Relaxation in Warm Dense Copper journal January 2016
Heterogeneous to homogeneous melting transition visualized with ultrafast electron diffraction journal June 2018
Femtosecond mega-electron-volt electron microdiffraction journal January 2018
Thermal boundary resistance for gold and CoFe alloy on silicon nitride films journal April 2012
Substrate influence in electron–phonon coupling measurements in thin Au films journal May 2007
Transient (000)-order attenuation effects in ultrafast transmission electron diffraction journal March 2011
Heat Capacity of Reference Materials: Cu and W journal October 1984
Mega-electron-volt ultrafast electron diffraction at SLAC National Accelerator Laboratory journal July 2015
Effects of electron scattering at metal-nonmetal interfaces on electron-phonon equilibration in gold films journal January 2009
Theory of Superconductivity journal May 1965
Femtosecond mega-electron-volt electron microdiffraction preprint January 2017

Figures / Tables (4)

FIG. 1(p. 2)figure FIG. 1
FIG. 2(p. 2)figure FIG. 2
FIG. 3(p. 3)figure FIG. 3
FIG. 4(p. 4)figure FIG. 4

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Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
polycrystalline material
ultrafast lasers
thermodynamic properties
electron diffraction