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  Ultrafast transient increase of oxygen octahedral rotations in a perovskite

Porer, M., Fechner, M., Kubli, M., Neugebauer, M. J., Parchenko, S., Esposito, V., et al. (2019). Ultrafast transient increase of oxygen octahedral rotations in a perovskite. Physical Review Research, 1(1): 012005. doi:10.1103/PhysRevResearch.1.012005.

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Datensatz-Permalink: https://hdl.handle.net/21.11116/0000-0004-70C7-D Versions-Permalink: https://hdl.handle.net/21.11116/0000-0004-70C8-C
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https://dx.doi.org/10.1103/PhysRevResearch.1.012005 (Verlagsversion)
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 Urheber:
Porer, M.1, Autor
Fechner, M.2, 3, Autor           
Kubli, M.4, Autor
Neugebauer, M. J.4, Autor
Parchenko, S.1, Autor
Esposito, V.5, Autor
Narayan, A.6, Autor
Spaldin, N. A.6, Autor
Huber, R.7, Autor
Radovic, M.1, Autor
Bothschafter, E. M.1, Autor
Glownia, J. M.8, Autor
Sato, T.8, Autor
Song, S.8, Autor
Johnson, S. L.4, 5, Autor
Staub, U.1, Autor
Affiliations:
1Swiss Light Source, Paul Scherrer Institute, ou_persistent22              
2Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              
3Center for Free-Electron Laser Science, ou_persistent22              
4Institute for Quantum Electronics, ETH Zürich, ou_persistent22              
5SwissFEL, Paul Scherrer Institute, ou_persistent22              
6Materials Theory, ETH Zürich, ou_persistent22              
7Department of Physics, University of Regensburg, ou_persistent22              
8LCLS, SLAC National Accelerator Laboratory, ou_persistent22              

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 Zusammenfassung: We present femtosecond hard x-ray diffraction experiments that study the effect of photodoping on the perovskite EuTiO3. We observe an ultrafast transient increase of reflection intensities that are directly related to the antiferrodistortive rotation of the oxygen octahedra. This increase relates directly to an increase of the order parameter associated with a purely structural phase transition that is opposite to the behavior of increasing the materials temperature. First-principles calculations show that the creation of electron-hole pairs leads to changes in the vibrational potential that is consistent with an increase of the order parameter. The order parameter increase can be understood from an ultrafast charge-transfer-induced reduction of the Goldschmidt tolerance factor, which is a fundamental control parameter for the properties of perovskites.

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Sprache(n): eng - English
 Datum: 2019-02-142019-08-09
 Publikationsstatus: Online veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1103/PhysRevResearch.1.012005
 Art des Abschluß: -

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Projektname : We thank H. Lemke for support in processing data acquired at LCLS. Static x-ray characterization of the sample was performed at the X04SA beamline (SLS) with technical assistance from D. Meister. We thank J. L. Mardegan, J. Raab, and M. Furthmeier for technical assistance on the all-optical studies. The research leading to these results has received funding from the Swiss National Science Foundation and its National Centers of Competence in Research, NCCR MUST and NCCR MARVEL. E.M.B. acknowledges funding from the European Community's Seventh Framework Programme (FP7/2007-2013) under Grant Agreement No. 290605 (PSI-FELLOW/COFUND). Computing resources were provided by the MERLIN cluster at the Paul Scherrer Institute. Use of the Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515.
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Titel: Physical Review Research
Genre der Quelle: Zeitschrift
 Urheber:
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Ort, Verlag, Ausgabe: College Park, Maryland, United States : American Physical Society (APS)
Seiten: - Band / Heft: 1 (1) Artikelnummer: 012005 Start- / Endseite: - Identifikator: ISSN: 2643-1564
CoNE: https://pure.mpg.de/cone/journals/resource/2643-1564