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Generation mechanism of terahertz coherent acoustic phonons in Fe
SLAC Natl Accelerator Lab, Stanford PULSE Inst, Menlo Pk, CA 94025 USA.;Stanford Univ, Dept Phys, Stanford, CA 94305 USA..
SLAC Natl Accelerator Lab, Stanford PULSE Inst, Menlo Pk, CA 94025 USA.;SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA..
SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA..
SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA.;Univ Amsterdam, Van der Waals Zeeman Inst, Kruislaan 403, NL-1018 XE Amsterdam, Netherlands..
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2016 (English)In: PHYSICAL REVIEW B, ISSN 2469-9950, Vol. 93, no 22, 220301Article in journal (Refereed) PublishedText
Abstract [en]

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.

Place, publisher, year, edition, pages
2016. Vol. 93, no 22, 220301
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-299038DOI: 10.1103/PhysRevB.93.220301ISI: 000377498000001OAI: oai:DiVA.org:uu-299038DiVA: diva2:948810
Funder
EU, European Research Council, 281043Swedish Research CouncilSwedish National Infrastructure for Computing (SNIC)Knut and Alice Wallenberg Foundation
Available from: 2016-07-13 Created: 2016-07-13 Last updated: 2016-07-13Bibliographically approved

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Maldonado, PabloOppeneer, Peter M.
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