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Displacive lattice excitation through nonlinear phononics viewed by femtosecond X-ray diffraction.pdf

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Displacive lattice excitation through nonlinear phononics viewed by femtosecond X-ray diffraction.pdf

Solid State Communications 169 (2013) 24–27 Contents lists available at SciVerse ScienceDirect Solid State Communications journal homepage: /locate/ssc Fast-track Communication Displacive lattice excitation through nonlinear phononics viewed by femtosecond X-ray diffraction M. F?rst a,n, R. Mankowsky a, H. Bromberger a, D.M. Fritz b, H. Lemke b, D. Zhu b, M. Chollet b, Y. Tomioka c, Y. Tokura d, R. Merlin e, J.P. Hill f, S.L. Johnson g, A. Cavalleri a,h,nn a Max-Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany b Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA c Correlated Electron Engineering Group, AIST, Tsukuba, Ibaraki 305-8562, Japan d Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan e Department of Physics, University of Michigan, Ann Arbor, MI 48109, USA f Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA g Institute for Quantum Electronics, Physics Department, ETH Zürich, 8093 Zürich, Switzerland h Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom article info Article history: Received 14 June 2013 Received in revised form 24 June 2013 Accepted 26 June 2013 by A. Pinczuk Available online 4 July 2013 Keywords: A. Correlated electron systems D. Ionic Raman Scattering D. Nonlinear phononics E. Time-resolved hard X-ray diffraction abstract The nonlinear lattice dynamics of La0.7Sr0.3MnO3, as initiated by strong mid-infrared femtosecond pulses made resonant with a speci?c 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 recti?cation of the vibrational ?eld is described within the framework of the Ionic Raman Scattering theory and ex