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

Research output: Contribution to journalArticle

10 Citations (Scopus)

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

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Lattice vibrations
x ray diffraction
Diffraction
transient response
X rays
diffraction
Transient analysis
curves
coupling coefficients
phonons
Phonons
pumps
crystal structure
expansion
propagation
probes
Crystal structure
shift
Pumps
Spectroscopy

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Lee, H. J., Workman, J., Wark, J. S., Averitt, R. D., Taylor, A. J., Roberts, J., ... 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
Lee, H. J. ; Workman, J. ; Wark, J. S. ; Averitt, R. D. ; Taylor, A. J. ; Roberts, J. ; McCulloch, Q. ; Hof, D. E. ; Hur, N. ; Cheong, Sang-Wook ; Funk, D. J. / Optically induced lattice dynamics probed with ultrafast x-ray diffraction. In: Physical Review B - Condensed Matter and Materials Physics. 2008 ; Vol. 77, No. 13.
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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.",
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Lee, HJ, Workman, J, Wark, JS, Averitt, RD, Taylor, AJ, Roberts, J, McCulloch, Q, Hof, DE, Hur, N, Cheong, S-W & Funk, DJ 2008, 'Optically induced lattice dynamics probed with ultrafast x-ray diffraction', Physical Review B - Condensed Matter and Materials Physics, vol. 77, no. 13, 132301. https://doi.org/10.1103/PhysRevB.77.132301

Optically induced lattice dynamics probed with ultrafast x-ray diffraction. / Lee, H. J.; Workman, J.; Wark, J. S.; Averitt, R. D.; Taylor, A. J.; Roberts, J.; McCulloch, Q.; Hof, D. E.; Hur, N.; Cheong, Sang-Wook; Funk, D. J.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 77, No. 13, 132301, 29.04.2008.

Research output: Contribution to journalArticle

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AU - Lee, H. J.

AU - Workman, J.

AU - Wark, J. S.

AU - Averitt, R. D.

AU - Taylor, A. J.

AU - Roberts, J.

AU - McCulloch, Q.

AU - Hof, D. E.

AU - Hur, N.

AU - Cheong, Sang-Wook

AU - Funk, D. J.

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N2 - 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.

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