Optically induced lattice dynamics probed with ultrafast x-ray diffraction

H. J. Lee, J. Workman, J. S. Wark, R. D. Averitt, A. J. Taylor, J. Roberts, Q. McCulloch, D. E. Hof, N. Hur, Sang-Wook Cheong, D. J. Funk

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Abstract

We have studied the picosecond lattice dynamics of optically pumped hexagonal LuMnO3 by using ultrafast x-ray diffraction. The results show a shift and broadening of the diffraction curve due to the stimulated lattice expansion. To understand the transient response of the lattice, the measured time- and angle-resolved diffraction curves are compared to a theoretical calculation based on the dynamical diffraction theory of coherent phonon propagation modified for the hexagonal crystal structure of LuMnO3. Our simulations reveal that a large coupling coefficient (c13) between the a-b plane and the c axis is required to fit the data. Though we interpret the transient response within the framework of thermal coherent phonons, we do not exclude the possibility of strong nonthermal coupling of the electronic excitation to the atomic framework. We compare this result to our previous coherent phonon studies of LuMnO3 in which we used optical pump-probe spectroscopy.

Original languageEnglish (US)
Article number132301
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume77
Issue number13
DOIs
StatePublished - Apr 29 2008

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Lee, H. J., Workman, J., Wark, J. S., Averitt, R. D., Taylor, A. J., Roberts, J., McCulloch, Q., Hof, D. E., Hur, N., Cheong, S-W., & Funk, D. J. (2008). Optically induced lattice dynamics probed with ultrafast x-ray diffraction. Physical Review B - Condensed Matter and Materials Physics, 77(13), [132301]. https://doi.org/10.1103/PhysRevB.77.132301