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Femtosecond phase-transition in hard x-ray excited bismuth
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SYSNO ASEP 0505015 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Femtosecond phase-transition in hard x-ray excited bismuth Author(s) Makita, M. (CH)
Vartiainen, I. (CH)
Mohacsi, I. (CH)
Caleman, C. (DE)
Diaz, A. (CH)
Jonsson, H.O. (SE)
Juranic, P. (CH)
Medvedev, Nikita (FZU-D) ORCID, RID
Meents, A. (DE)
Mozzanica, A. (CH)
Opara, N.L. (CH)
Padeste, C. (CH)
Panneels, V. (CH)
Saxena, V. (DE)
Sikorski, M. (US)
Song, S. (US)
Vera, L. (CH)
Willmott, P. R. (CH)
Beaud, P. (CH)
Milne, C. J. (CH)
Ziaja-Motyka, B. (DE)
David, C. (CH)Number of authors 22 Article number 602 Source Title Scientific Reports. - : Nature Publishing Group - ISSN 2045-2322
Roč. 9, Jan (2019), s. 1-7Number of pages 7 s. Language eng - English Country GB - United Kingdom Keywords hard x-ray excitation in bismuth single crystal ; femtsosecond phase-transition ; electron-ion equilibration process Subject RIV BH - Optics, Masers, Lasers OECD category Optics (including laser optics and quantum optics) Method of publishing Open access Institutional support FZU-D - RVO:68378271 UT WOS 000456554600041 EID SCOPUS 85060536626 DOI 10.1038/s41598-018-36216-3 Annotation The evolution of bismuth crystal structure upon excitation of its A1g phonon has been intensely studied with short pulse optical lasers. Here we present the first-time observation of a hard x-ray induced ultrafast phase transition in a bismuth single crystal at high intensities (~1014 W/cm2). The lattice evolution was followed using a recently demonstrated x-ray single-shot probing setup. The time evolution of the (111) Bragg peak intensity showed strong dependence on the excitation fluence. After exposure to a sufficiently intense x-ray pulse, the peak intensity dropped to zero within 300 fs, i.e. faster than one oscillation period of the A1g mode at room temperature. Our analysis indicates a nonthermal origin of a lattice disordering process, and excludes interpretations based on electron-ion equilibration process, or on thermodynamic heating process leading to plasma formation. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2020 Electronic address http://hdl.handle.net/11104/0296542
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