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  Ultrafast Relaxation Dynamics of the Antiferrodistortive Phase in Ca Doped SrTiO3

Porer, M., Fechner, M., Bothschafter, E., Rettig, L., Savoini, M., Esposito, V., et al. (2018). Ultrafast Relaxation Dynamics of the Antiferrodistortive Phase in Ca Doped SrTiO3. Physical Review Letters, 121(5): 055701. doi:10.1103/PhysRevLett.121.055701.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-EE2D-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-560D-F
Genre: Journal Article

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https://arxiv.org/abs/1805.00580 (Preprint)
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 Creators:
Porer, M.1, Author
Fechner, M.2, 3, Author              
Bothschafter, E. M.1, Author
Rettig, L.1, 4, Author
Savoini, M.1, 5, Author
Esposito, V.1, Author
Rittmann, J.1, Author
Kubli, M.5, Author
Neugebauer, M. J.5, Author
Abreu, E.5, Author
Kubacka, T.5, Author
Huber, T.5, Author
Lantz, G.5, Author
Parchenko, S.1, Author
Grübel, S.1, Author
Paarmann, A.4, Author
Noack, J.6, Author
Beaud, P.1, Author
Ingold, G.1, Author
Aschauer, U.7, Author
Johnson, S. L.5, AuthorStaub, U.1, Author more..
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              
3Materials Theory, ETH Zürich, ou_persistent22              
4Department of Physical Chemistry, Fritz Haber Institute of the Max Planck Society, ou_persistent22              
5Institute for Quantum Electronics, ETH Zürich, ou_persistent22              
6Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, ou_persistent22              
7Department of Chemistry and Biochemistry, University of Bern, ou_persistent22              

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 Abstract: The ultrafast dynamics of the octahedral rotation in Ca:SrTiO3 is studied by time-resolved x-ray diffraction after photoexcitation over the band gap. By monitoring the diffraction intensity of a superlattice reflection that is directly related to the structural order parameter of the soft-mode driven antiferrodistortive phase in Ca:SrTiO3, we observe an ultrafast relaxation on a 0.2 ps timescale of the rotation of the oxygen octahedron, which is found to be independent of the initial temperature despite large changes in the corresponding soft-mode frequency. A further, much smaller reduction on a slower picosecond timescale is attributed to thermal effects. Time-dependent density-functional-theory calculations show that the fast response can be ascribed to an ultrafast displacive modification of the soft-mode potential towards the normal state induced by holes created in the oxygen 2p states.

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Language(s): eng - English
 Dates: 2018-04-302018-08-032018-08-03
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevLett.121.055701
arXiv: 1805.00580
 Degree: -

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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 121 (5) Sequence Number: 055701 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: /journals/resource/954925433406_1