Imaging coherent phonons and precursor dynamics in LaFeAsO with 4D ultrafast electron microscopy
Abstract
In this work, we used 4D ultrafast electron microscopy (UEM) to directly image femtosecond photoinduced structural dynamics in single-crystal LaFeAsO at initial temperatures of 300 and 100 K, above and below the known structural and magnetic phase-transition temperatures, respectively. With nanometer-picosecond resolution, we resolved an initial (precursor) sigmoidlike response arising from photothermal expansion and lattice reorientation that precedes the onset of propagating coherent acoustic phonons (CAPs). In the specific regions probed, the precursor response at 100 K is shorter than at 300 K ($$t$$0.5;100 K = 11.3ps vs $$t$$0.5;300 K = 17.8ps), and the CAP oscillation frequency is lowered with cooling (ƒCAP;100 K = 12 GHz vs ƒCAP;300 K = 21 GHz), correlated to known lattice softening due to the structural phase change. The transient CAP behaviors at 300 K are dispersive, displaying an exponentially decaying phase velocity over the first nanosecond. Further, the CAP symmetry at 300 K matches a first-order antisymmetric shear mode (A1), while at 100 K it is best matched by a mostly nondispersive zero-order symmetric mode (S0). These findings illustrate the sensitivity of UEM imaging to spatially heterogeneous dynamics in the Fe-pnictide materials and more broadly in other quantum materials.
- Authors:
-
[3]
- Univ. of Minnesota, Minneapolis, MN (United States); Univ. of California, Santa Barbara, CA (United States)
- Univ. of Minnesota, Minneapolis, MN (United States); Micron Technology, Boise, ID (United States)
- Univ. of Minnesota, Minneapolis, MN (United States)
- Publication Date:
- Research Org.:
- Univ. of Minnesota, Minneapolis, MN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF)
- OSTI Identifier:
- 1846206
- Grant/Contract Number:
- SC0018204; SC0016371; DMR-2011401
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Materials
- Additional Journal Information:
- Journal Volume: 6; Journal Issue: 2; Journal ID: ISSN 2475-9953
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Gnabasik, Ryan A., Suri, Pranav K., Chen, Jialiang, and Flannigan, David J. Imaging coherent phonons and precursor dynamics in LaFeAsO with 4D ultrafast electron microscopy. United States: N. p., 2022.
Web. doi:10.1103/PhysRevMaterials.6.024802.
Gnabasik, Ryan A., Suri, Pranav K., Chen, Jialiang, & Flannigan, David J. Imaging coherent phonons and precursor dynamics in LaFeAsO with 4D ultrafast electron microscopy. United States. https://doi.org/10.1103/PhysRevMaterials.6.024802
Gnabasik, Ryan A., Suri, Pranav K., Chen, Jialiang, and Flannigan, David J. Tue .
"Imaging coherent phonons and precursor dynamics in LaFeAsO with 4D ultrafast electron microscopy". United States. https://doi.org/10.1103/PhysRevMaterials.6.024802. https://www.osti.gov/servlets/purl/1846206.
@article{osti_1846206,
title = {Imaging coherent phonons and precursor dynamics in LaFeAsO with 4D ultrafast electron microscopy},
author = {Gnabasik, Ryan A. and Suri, Pranav K. and Chen, Jialiang and Flannigan, David J.},
abstractNote = {In this work, we used 4D ultrafast electron microscopy (UEM) to directly image femtosecond photoinduced structural dynamics in single-crystal LaFeAsO at initial temperatures of 300 and 100 K, above and below the known structural and magnetic phase-transition temperatures, respectively. With nanometer-picosecond resolution, we resolved an initial (precursor) sigmoidlike response arising from photothermal expansion and lattice reorientation that precedes the onset of propagating coherent acoustic phonons (CAPs). In the specific regions probed, the precursor response at 100 K is shorter than at 300 K ($t$0.5;100 K = 11.3ps vs $t$0.5;300 K = 17.8ps), and the CAP oscillation frequency is lowered with cooling (ƒCAP;100 K = 12 GHz vs ƒCAP;300 K = 21 GHz), correlated to known lattice softening due to the structural phase change. The transient CAP behaviors at 300 K are dispersive, displaying an exponentially decaying phase velocity over the first nanosecond. Further, the CAP symmetry at 300 K matches a first-order antisymmetric shear mode (A1), while at 100 K it is best matched by a mostly nondispersive zero-order symmetric mode (S0). These findings illustrate the sensitivity of UEM imaging to spatially heterogeneous dynamics in the Fe-pnictide materials and more broadly in other quantum materials.},
doi = {10.1103/PhysRevMaterials.6.024802},
journal = {Physical Review Materials},
number = 2,
volume = 6,
place = {United States},
year = {Tue Feb 22 00:00:00 EST 2022},
month = {Tue Feb 22 00:00:00 EST 2022}
}
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