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Title: Structural dynamics of LaVO3 on the nanosecond time scale

Abstract

Due to the strong dependence of electronic properties on the local bonding environment, a full characterization of the structural dynamics in ultrafast experiments is critical. Here, we report the dynamics and structural refinement at nanosecond time scales of a perovskite thin film by combining optical excitation with time-resolved X-ray diffraction. This is achieved by monitoring the temporal response of both integer and half-integer diffraction peaks of LaVO3 in response to an above-band-gap 800 nm pump pulse. We find that the lattice expands by 0.1% out of plane, and the relaxation is characterized by a biexponential decay with 2 and 12 ns time scales. We analyze the relative intensity change in half-integer peaks and show that the distortions to the substructure are small: the oxygen octahedral rotation angles decrease by similar to 0.3 degrees and La displacements decrease by similar to 0.2 pm, which directly corresponds to an similar to 0.8 degrees increase in the V-O-V bond-angles, an in-plane V-O bond length reduction of similar to 0.3 pm, and an unchanged out-of-plane bond length. This demonstration of tracking the atomic positions in a pump-probe experiment provides experimentally accessible values for structural and electronic tunability in this class of materials and willmore » stimulate future experiments.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [3];  [6];  [6];  [6];  [3]
  1. Pennsylvania State Univ., University Park, PA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Pennsylvania State Univ., University Park, PA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Pennsylvania State Univ., University Park, PA (United States)
  4. Pennsylvania State Univ., University Park, PA (United States); Univ. of California, Berkeley, CA (United States)
  5. Pennsylvania State Univ., University Park, PA (United States); Tokyo Inst. of Technology, Yokohama (Japan)
  6. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF)
OSTI Identifier:
1545767
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Structural Dynamics
Additional Journal Information:
Journal Volume: 6; Journal Issue: 1; Journal ID: ISSN 2329-7778
Publisher:
American Crystallographic Association/AIP
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Brahlek, Matthew, Stoica, Vladimir A., Lapano, Jason, Zhang, Lei, Akamatsu, Hirofumi, Tung, I-Cheng, Gopalan, Venkatraman, Walko, Donald A., Wen, Haidan, Freeland, John W., and Engel-Herbert, Roman. Structural dynamics of LaVO3 on the nanosecond time scale. United States: N. p., 2019. Web. doi:10.1063/1.5045704.
Brahlek, Matthew, Stoica, Vladimir A., Lapano, Jason, Zhang, Lei, Akamatsu, Hirofumi, Tung, I-Cheng, Gopalan, Venkatraman, Walko, Donald A., Wen, Haidan, Freeland, John W., & Engel-Herbert, Roman. Structural dynamics of LaVO3 on the nanosecond time scale. United States. doi:10.1063/1.5045704.
Brahlek, Matthew, Stoica, Vladimir A., Lapano, Jason, Zhang, Lei, Akamatsu, Hirofumi, Tung, I-Cheng, Gopalan, Venkatraman, Walko, Donald A., Wen, Haidan, Freeland, John W., and Engel-Herbert, Roman. Fri . "Structural dynamics of LaVO3 on the nanosecond time scale". United States. doi:10.1063/1.5045704. https://www.osti.gov/servlets/purl/1545767.
@article{osti_1545767,
title = {Structural dynamics of LaVO3 on the nanosecond time scale},
author = {Brahlek, Matthew and Stoica, Vladimir A. and Lapano, Jason and Zhang, Lei and Akamatsu, Hirofumi and Tung, I-Cheng and Gopalan, Venkatraman and Walko, Donald A. and Wen, Haidan and Freeland, John W. and Engel-Herbert, Roman},
abstractNote = {Due to the strong dependence of electronic properties on the local bonding environment, a full characterization of the structural dynamics in ultrafast experiments is critical. Here, we report the dynamics and structural refinement at nanosecond time scales of a perovskite thin film by combining optical excitation with time-resolved X-ray diffraction. This is achieved by monitoring the temporal response of both integer and half-integer diffraction peaks of LaVO3 in response to an above-band-gap 800 nm pump pulse. We find that the lattice expands by 0.1% out of plane, and the relaxation is characterized by a biexponential decay with 2 and 12 ns time scales. We analyze the relative intensity change in half-integer peaks and show that the distortions to the substructure are small: the oxygen octahedral rotation angles decrease by similar to 0.3 degrees and La displacements decrease by similar to 0.2 pm, which directly corresponds to an similar to 0.8 degrees increase in the V-O-V bond-angles, an in-plane V-O bond length reduction of similar to 0.3 pm, and an unchanged out-of-plane bond length. This demonstration of tracking the atomic positions in a pump-probe experiment provides experimentally accessible values for structural and electronic tunability in this class of materials and will stimulate future experiments.},
doi = {10.1063/1.5045704},
journal = {Structural Dynamics},
number = 1,
volume = 6,
place = {United States},
year = {2019},
month = {1}
}

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