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Femtosecond phase-transition in hard x-ray excited bismuth
Paul Scherrer Inst, CH-5232 Villigen, Switzerland..
Paul Scherrer Inst, CH-5232 Villigen, Switzerland..
Paul Scherrer Inst, CH-5232 Villigen, Switzerland.;LOrme Merisiers, Synchrotron SOLEIL, F-91190 Saint Aubin, France..
Deutsch Elektronen Synchrotron DESY, CFEL, D-22667 Hamburg, Germany.;Uppsala Univ, Dept Phys & Astron, SE-751 Uppsala, Sweden..
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2019 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, article id 602Article in journal (Refereed) Published
Abstract [en]

The evolution of bismuth crystal structure upon excitation of its A(1g) 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 (similar to 10(14) W/cm(2)). 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 A(1g) 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.

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NATURE PUBLISHING GROUP , 2019. Vol. 9, article id 602
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URN: urn:nbn:se:kth:diva-243946DOI: 10.1038/s41598-018-36216-3ISI: 000456554600041PubMedID: 30679456Scopus ID: 2-s2.0-85060536626OAI: oai:DiVA.org:kth-243946DiVA, id: diva2:1293910
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QC 20190305

Available from: 2019-03-05 Created: 2019-03-05 Last updated: 2019-03-05Bibliographically approved

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Jönsson, Henrik Olof

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