Journal
SOLID STATE COMMUNICATIONS
Volume 169, Issue -, Pages 24-27Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2013.06.024
Keywords
Correlated electron systems; Ionic Raman Scattering; Nonlinear phononics; Time-resolved hard X-ray diffraction
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Funding
- US Department of Energy, Division of Materials Science [DE-AC02-98CH10886]
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The nonlinear lattice dynamics of La0.7Sr0.3MnO3, as initiated by strong mid-infrared femtosecond pulses made resonant with a specific lattice vibration, are measured with ultrafast X-ray diffraction at the LCLS free electron laser. Our experiments show that large amplitude excitation of an infrared-active stretching mode leads also to a displacive motion along the coordinate of a second, anharmonically coupled, Raman mode. This rectification of the vibrational field is described within the framework of the Ionic Raman Scattering theory and explains how direct lattice excitation in the nonlinear regime can induce a structural phase transition. (C) 2013 Elsevier Ltd. All rights reserved.
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