Journal
PHYSICAL REVIEW LETTERS
Volume 121, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.055701
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Funding
- Swiss National Science Foundation
- National Centers of Competence in Research
- NCCR MUST
- NCCR MARVEL
- European Community's Seventh Framework Programme (FP7/2007-2013) [290605]
- ETH Zurich Postdoctoral Fellowship Program
- Marie Curie Actions for People COFUND Program
- ETH Zurich
- ERC [291151]
- SNF Professorship [PP00P2-157615]
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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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