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Ultrafast lattice dynamics and electron-phonon coupling in platinum extracted with a global fitting approach for time-resolved polycrystalline diffraction data

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Zahn,  Daniela
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Seiler,  Helene
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Windsor,  Yoav William
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Institut f€ur Optik und Atomare Physik, Technische Universit€at Berlin;

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Ernstorfer,  Ralph
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Institut f€ur Optik und Atomare Physik, Technische Universit€at Berlin;

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2012.10428_2.pdf
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4.0000120.pdf
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Citation

Zahn, D., Seiler, H., Windsor, Y. W., & Ernstorfer, R. (2021). Ultrafast lattice dynamics and electron-phonon coupling in platinum extracted with a global fitting approach for time-resolved polycrystalline diffraction data. Structural Dynamics, 8(6): 064301. doi:10.1063/4.0000120.


Cite as: https://hdl.handle.net/21.11116/0000-0007-DA13-E
Abstract
Quantitative knowledge of electron-phonon coupling is important for many applications as well as for the fundamental understanding of nonequilibrium relaxation processes. Time-resolved diffraction provides direct access to this knowledge through its sensitivity to laser-induced lattice dynamics. Here, we present an approach for analyzing time-resolved polycrystalline diffraction data. A two-step routine is used to minimize the number of time-dependent fit parameters. The lattice dynamics are extracted reliably by finding the best fit to the full transient diffraction pattern rather than by analyzing transient changes of individual Debye-Scherrer rings. We apply this approach to platinum, an important component of novel photocatalytic and spintronic applications, for which a large variation of literature values exists for the electron-phonon coupling parameter Gep. Based on the extracted evolution of the atomic mean squared displacement (MSD) and using a two-temperature model (TTM), we obtain Gep=(3.9±0.2) ⋅ 1017W/m3K. We find that at least up to an absorbed energy density of 124 J/cm3, Gep is not fluence-dependent. Our results for the lattice dynamics of platinum provide insights into electron-phonon coupling and phonon thermalization and constitute a basis for quantitative descriptions of platinum-based heterostructures in nonequilibrium conditions.