Generation mechanism of terahertz coherent acoustic phonons in Fe

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F16%3A10324598" target="_blank" >RIV/00216208:11320/16:10324598 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1103/PhysRevB.93.220301" target="_blank" >http://dx.doi.org/10.1103/PhysRevB.93.220301</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevB.93.220301" target="_blank" >10.1103/PhysRevB.93.220301</a>

Result language
angličtina
Original language name
Generation mechanism of terahertz coherent acoustic phonons in Fe
Original language description
We use femtosecond time-resolved hard x-ray scattering to detect coherent acoustic phonons generated during ultrafast laser excitation of ferromagnetic bcc Fe films grown on MgO(001). We observe the coherent longitudinal-acoustic phonons as a function of wave vector through analysis of the temporal oscillations in the x-ray scattering signal. The width of the extracted strain wave front associated with this coherent motion is similar to 100 fs. An effective electronic Gruneisen parameter is extracted within a two-temperature model. However, ab initio calculations show that the phonons are nonthermal on the time scale of the experiment, which calls into question the validity of extracting physical constants by fitting such a two-temperature model.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BM - Solid-state physics and magnetism
OECD FORD branch
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Project
<a href="/en/project/GJ15-08740Y" target="_blank" >GJ15-08740Y: Spin current generation on a femtosecond timescale</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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