Ultrafast Structural Phase Transition Driven by Photoinduced Melting of Charge and Orbital Order
- 9 October 2009
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 103 (15), 155702
- https://doi.org/10.1103/physrevlett.103.155702
Abstract
We use femtosecond x-ray diffraction to probe directly the structural dynamics of a charge ordered and orbitally ordered thin film of initiated by an ultrafast optical pulse. At low excitation fluences we observe the displacive excitation of a coherent optical phonon. Under high excitation conditions we observe a complete phase transition within 1 ps via the disappearance of a superlattice reflection. The initial step of the phase transition occurs on a time scale significantly faster than the 200 fs time resolution of our experiment.
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