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Journal Article

Ultrafast Relaxation Dynamics of the Antiferrodistortive Phase in Ca Doped SrTiO3

MPS-Authors
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Rettig,  Laurenz
Swiss Light Source, Paul Scherrer Institute;
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Paarmann,  Alexander
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Noack,  Johannes
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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1805.00580.pdf
(Preprint), 3MB

PhysRevLett.121.055701.pdf
(Publisher version), 2MB

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Citation

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.


Cite as: https://hdl.handle.net/21.11116/0000-0001-4332-B
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.