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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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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-70C7-D Version Permalink: http://hdl.handle.net/21.11116/0000-0004-BF2E-3
Genre: Journal Article

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PhysRevResearch.1.012005.pdf (Publisher version), 993KB
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 Creators:
Porer, M.1, Author
Fechner, M.2, 3, Author              
Kubli, M.4, Author
Neugebauer, M. J.4, Author
Parchenko, S.1, Author
Esposito, V.5, Author
Narayan, A.6, Author
Spaldin, N. A.6, Author
Huber, R.7, Author
Radovic, M.1, Author
Bothschafter, E. M.1, Author
Glownia, J. M.8, Author
Sato, T.8, Author
Song, S.8, Author
Johnson, S. L.4, 5, Author
Staub, U.1, Author
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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 Abstract: 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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Language(s): eng - English
 Dates: 2019-02-142019-08-09
 Publication Status: Published online
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 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevResearch.1.012005
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Project name : 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.
Grant ID : 290605
Funding program : Funding Programme 7 (FP7)
Funding organization : European Commission (EC)

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Title: Physical Review Research
Source Genre: Journal
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Publ. Info: College Park, Maryland, United States : American Physical Society (APS)
Pages: - Volume / Issue: 1 (1) Sequence Number: 012005 Start / End Page: - Identifier: ISSN: 2643-1564
CoNE: https://pure.mpg.de/cone/journals/resource/2643-1564