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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

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.

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2012.10428_2.pdf (Preprint), 3MB
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 Creators:
Zahn, Daniela1, Author           
Seiler, Helene1, Author           
Windsor, Yoav William1, 2, Author           
Ernstorfer, Ralph1, 2, Author           
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Institut f€ur Optik und Atomare Physik, Technische Universit€at Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany, ou_persistent22              

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Free keywords: Condensed Matter, Materials Science, cond-mat.mtrl-sci
 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.

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Language(s): eng - English
 Dates: 2020-12-182021-08-042021-06-022021-10-182021-11-15
 Publication Status: Published online
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: arXiv: 2012.10428
DOI: 10.1063/4.0000120
 Degree: -

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Project name : FLATLAND - Electron-lattice-spin correlations and many-body phenomena in 2D semiconductors and related heterostructures
Grant ID : 682843
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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Title: Structural Dynamics
Source Genre: Journal
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Publ. Info: Melville, NY : American Institute of Physics
Pages: 10 Volume / Issue: 8 (6) Sequence Number: 064301 Start / End Page: - Identifier: ISSN: 2329-7778
CoNE: https://pure.mpg.de/cone/journals/resource/2329-7778