Ultrafast Relaxation Dynamics of the Antiferrodistortive Phase in Ca Doped SrTiO_{3}.
- Porer M Swiss Light Source, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland.
- Fechner M Max Planck Institute for the Structure and Dynamics of Matter, CFEL, 22761 Hamburg, Germany.
- Bothschafter EM Swiss Light Source, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland.
- Rettig L Swiss Light Source, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland.
- Savoini M Swiss Light Source, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland.
- Esposito V Swiss Light Source, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland.
- Rittmann J Swiss Light Source, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland.
- Kubli M Institute for Quantum Electronics, ETH Zürich, 8093 Zürich, Switzerland.
- Neugebauer MJ Institute for Quantum Electronics, ETH Zürich, 8093 Zürich, Switzerland.
- Abreu E Institute for Quantum Electronics, ETH Zürich, 8093 Zürich, Switzerland.
- Kubacka T Institute for Quantum Electronics, ETH Zürich, 8093 Zürich, Switzerland.
- Huber T Institute for Quantum Electronics, ETH Zürich, 8093 Zürich, Switzerland.
- Lantz G Institute for Quantum Electronics, ETH Zürich, 8093 Zürich, Switzerland.
- Parchenko S Swiss Light Source, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland.
- Grübel S Swiss Light Source, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland.
- Paarmann A Department of Physical Chemistry, Fritz Haber Institute of the Max Planck Society, 14195 Berlin, Germany.
- Noack J Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, 14195 Berlin, Germany.
- Beaud P Swiss Light Source, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland.
- Ingold G Swiss Light Source, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland.
- Aschauer U Department of Chemistry and Biochemistry, University of Bern, 3012 Bern, Switzerland.
- Johnson SL Institute for Quantum Electronics, ETH Zürich, 8093 Zürich, Switzerland.
- Staub U Swiss Light Source, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland.
- 2018-08-18
Published in:
- Physical review letters. - 2018
English
The ultrafast dynamics of the octahedral rotation in Ca:SrTiO_{3} 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:SrTiO_{3}, 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.
- Language
-
- English
- Open access status
- green
- Identifiers
-
- DOI 10.1103/PhysRevLett.121.055701
- PMID 30118273
- Persistent URL
- https://sonar.ch/global/documents/201393
Statistics
Document views: 25
File downloads:
- fulltext.pdf: 0