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Disentangling transient charge order from structural dynamics contributions during coherent atomic motion studied by ultrafast resonant x-ray diffraction

Rettig, L. ; Caviezel, A. ; Mariager, S. O. ; Ingold, G. ; Dornes, C. ; Huang, S. W. LU ; Johnson, J. A. ; Radovic, M. ; Huber, T. and Kubacka, T. , et al. (2019) In Physical Review B 99(13).
Abstract

We report on the ultrafast dynamics of charge order and structural response during the photoinduced suppression of charge and orbital order in a mixed-valence manganite. Employing femtosecond time-resolved resonant x-ray diffraction below and at the Mn K absorption edge, we present a method to disentangle the transient charge order and structural dynamics in thin films of Pr0.5Ca0.5MnO3. Based on the static resonant scattering spectra, we extract the dispersion correction of charge-ordered Mn3+ and Mn4+ ions, allowing us to separate the transient contributions of purely charge order from structural contributions to the scattering amplitude after optical excitation. Our finding of a coherent structural mode at around 2.3THz, which... (More)

We report on the ultrafast dynamics of charge order and structural response during the photoinduced suppression of charge and orbital order in a mixed-valence manganite. Employing femtosecond time-resolved resonant x-ray diffraction below and at the Mn K absorption edge, we present a method to disentangle the transient charge order and structural dynamics in thin films of Pr0.5Ca0.5MnO3. Based on the static resonant scattering spectra, we extract the dispersion correction of charge-ordered Mn3+ and Mn4+ ions, allowing us to separate the transient contributions of purely charge order from structural contributions to the scattering amplitude after optical excitation. Our finding of a coherent structural mode at around 2.3THz, which primarily modulates the lattice but does not strongly affect the charge order, supports the picture of the charge order being the driving force of the combined charge, orbital, and structural transition.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
99
issue
13
article number
134302
publisher
American Physical Society
external identifiers
  • scopus:85064125082
ISSN
2469-9950
DOI
10.1103/PhysRevB.99.134302
language
English
LU publication?
yes
additional info
Funding Information: This research was carried out on the XPP Instrument at the Linac Coherent Light Source (LCLS) at the SLAC National Accelerator Laboratory. LCLS is an Office of Science User Facility operated for the U.S. Department of Energy Office of Science by Stanford University. Use of LCLS, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-76SF00515. Static resonant x-ray diffraction experiments were performed at the X04SA Material Science beamline at the Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland. This work was supported by the NCCR Molecular Ultrafast Science and Technology (NCCR MUST), a research instrument of the Swiss National Science Foundation (SNSF), and by the German Research Foundation (DFG) within the Emmy Noether program (Grant No. RE 3977/1-1). A.C. and T.K. acknowledge financial support by SNSF, Grants No. 200021_124496 and 200021_144115, respectively. Publisher Copyright: © 2019 American Physical Society.
id
88b56cc9-1e95-4763-91f0-5a7953e0b66f
date added to LUP
2022-04-04 10:14:55
date last changed
2022-04-27 21:01:36
@article{88b56cc9-1e95-4763-91f0-5a7953e0b66f,
  abstract     = {{<p>We report on the ultrafast dynamics of charge order and structural response during the photoinduced suppression of charge and orbital order in a mixed-valence manganite. Employing femtosecond time-resolved resonant x-ray diffraction below and at the Mn K absorption edge, we present a method to disentangle the transient charge order and structural dynamics in thin films of Pr0.5Ca0.5MnO3. Based on the static resonant scattering spectra, we extract the dispersion correction of charge-ordered Mn3+ and Mn4+ ions, allowing us to separate the transient contributions of purely charge order from structural contributions to the scattering amplitude after optical excitation. Our finding of a coherent structural mode at around 2.3THz, which primarily modulates the lattice but does not strongly affect the charge order, supports the picture of the charge order being the driving force of the combined charge, orbital, and structural transition.</p>}},
  author       = {{Rettig, L. and Caviezel, A. and Mariager, S. O. and Ingold, G. and Dornes, C. and Huang, S. W. and Johnson, J. A. and Radovic, M. and Huber, T. and Kubacka, T. and Ferrer, A. and Lemke, H. T. and Chollet, M. and Zhu, D. and Glownia, J. M. and Sikorski, M. and Robert, A. and Nakamura, M. and Kawasaki, M. and Tokura, Y. and Johnson, S. L. and Beaud, P. and Staub, U.}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  month        = {{04}},
  number       = {{13}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Disentangling transient charge order from structural dynamics contributions during coherent atomic motion studied by ultrafast resonant x-ray diffraction}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.99.134302}},
  doi          = {{10.1103/PhysRevB.99.134302}},
  volume       = {{99}},
  year         = {{2019}},
}