Suzana, AF;
Koch, R;
Wu, L;
Assefa, TA;
Kim, S;
Choi, S;
Lee, H;
... Robinson, IK; + view all
(2023)
Compressive effects in melting of palladium thin films studied by ultrafast x-ray diffraction.
Physical Review B
, 107
(21)
, Article 214303. 10.1103/PhysRevB.107.214303.
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Abstract
With the advent of x-ray free electron lasers (XFELs), ultrafast laser excitation leading to nonequilibrium states has become an important way to investigate thermal processes. Here, we use ultrafast x-ray diffraction in an XFEL pump-probe experiment to examine the lattice dynamics of 300 nm polycrystalline palladium (Pd) thin films. In our experiment, at higher laser fluence levels, we directly observe a compression effect launched from the surface skin layer heated by the optical pulse which propagates across the film over the first tens of picoseconds. After that, a lattice expansion becomes dominant, followed by a quasi-steady state lasting into the nanosecond timescale. For the lowest fluence, the compression component is not detected, indicating that the dynamics is highly dependent on the laser power. Our results shed light on the dynamics behind ultrafast processes in metallic Pd, and they can be extended to different crystalline structures.
| Type: | Article |
|---|---|
| Title: | Compressive effects in melting of palladium thin films studied by ultrafast x-ray diffraction |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevB.107.214303 |
| Publisher version: | https://doi.org/10.1103/PhysRevB.107.214303 |
| Language: | English |
| Additional information: | Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10174355 |
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