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research article
Ultrafast Structural Phase Transition Driven by Photoinduced Melting of Charge and Orbital Order
We use femtosecond x-ray diffraction to probe directly the structural dynamics of a charge ordered and orbitally ordered thin film of La0.42Ca0.58MnO3 initiated by an ultrafast optical pulse. At low excitation fluences we observe the displacive excitation of a coherent optical A(g) 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.
Type
research article
Web of Science ID
WOS:000270672100040
Authors
Beaud, P.
•
Johnson, S. L.
•
Vorobeva, E.
•
Staub, U.
•
De Souza, R. A.
•
•
Jia, Q. X.
•
Ingold, G.
Publication date
2009
Publisher
Published in
Volume
103
Issue
15
Article Number
155702
Peer reviewed
REVIEWED
EPFL units
Available on Infoscience
November 30, 2010
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