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  Ultrafast Relaxation Dynamics of the Antiferrodistortive Phase in Ca Doped SrTiO3

Porer, M., Fechner, M., Bothschafter, E. M., Rettig, L., Savoini, M., Esposito, V., et al. (2018). Ultrafast Relaxation Dynamics of the Antiferrodistortive Phase in Ca Doped SrTiO3. Physical Review Letters, 121(05): 055701. doi:10.1103/PhysRevLett.121.055701.

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 Creators:
Porer, M.1, Author
Fechner, M.2, 3, Author
Bothschafter, E. M.1, Author
Rettig, Laurenz1, 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, Alexander4, Author           
Noack, Johannes6, 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, 5232 Villigen-PSI, Switzerland, ou_persistent22              
2Max Planck Institute for the Structure and Dynamics of Matter, CFEL, 22761 Hamburg, Germany, ou_persistent22              
3Materials Theory, ETH Zürich, 8093 Zürich, Switzerland, ou_persistent22              
4Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
5Institute for Quantum Electronics, ETH Zürich, 8093 Zürich, Switzerland, ou_persistent22              
6Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
7Department of Chemistry and Biochemistry, University of Bern, 3012 Bern, Switzerland, ou_persistent22              

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Free keywords: Condensed Matter, Materials Science, cond-mat.mtrl-sci
 Abstract: The ultrafast dynamics of the octahedral rotation in Ca:SrTiO3 is studied by time resolved x-ray diffraction after photo excitation 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 a ultrafast relaxation on a 0.2 ps timescale of the rotation of the oxygen octahedron, which is found to be independent of the initial temperaure 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: 2018-05-012018-04-302018-08-032018-08
 Publication Status: Issued
 Pages: 5
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 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: 5 Volume / Issue: 121 (05) Sequence Number: 055701 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1