---
_id: '47993'
abstract:
- lang: eng
  text: Structural strain severely impacts material properties, such as the linear
    and nonlinear optical response. Moreover, strain plays a key role, e.g., in the
    physics of ferroelectrics and, in particular, of their domain walls. μ-Raman spectroscopy
    is a well-suited technique for the investigation of such strain effects as it
    allows to measure the lattice dynamics locally. However, quantifying and reconstructing
    strain fields from Raman maps requires knowledge on the strain dependence of phonon
    frequencies. In this paper, we have analyzed both theoretically and experimentally
    the phonon frequencies in the widely used ferroelectrics lithium niobate and lithium
    tantalate as a function of uniaxial strain via density functional theory and μ-Raman
    spectroscopy. Overall, we find a good agreement between our ab initio models and
    the experimental data performed with a stress cell. The majority of phonons show
    an increase in frequency under compressive strain, whereas the opposite is observed
    for tensile strains. Moreover, for E-type phonons, we observe the lifting of degeneracy
    already at moderate strain fields (i.e., at ±0.2%) along the x and y directions.
    This paper, hence, allows for the systematic analysis of three-dimensional strains
    in modern-type bulk and thin-film devices assembled from lithium niobate and tantalate.
article_number: '024420'
article_type: original
author:
- first_name: Ekta
  full_name: Singh, Ekta
  last_name: Singh
- first_name: Mike N.
  full_name: Pionteck, Mike N.
  last_name: Pionteck
- first_name: Sven
  full_name: Reitzig, Sven
  last_name: Reitzig
- first_name: Michael
  full_name: Lange, Michael
  last_name: Lange
- first_name: Michael
  full_name: Rüsing, Michael
  id: '22501'
  last_name: Rüsing
  orcid: 0000-0003-4682-4577
- first_name: Lukas M.
  full_name: Eng, Lukas M.
  last_name: Eng
- first_name: Simone
  full_name: Sanna, Simone
  last_name: Sanna
citation:
  ama: Singh E, Pionteck MN, Reitzig S, et al. Vibrational properties of LiNbO3 and
    LiTaO3 under uniaxial stress. <i>Physical Review Materials</i>. 2023;7(2). doi:<a
    href="https://doi.org/10.1103/physrevmaterials.7.024420">10.1103/physrevmaterials.7.024420</a>
  apa: Singh, E., Pionteck, M. N., Reitzig, S., Lange, M., Rüsing, M., Eng, L. M.,
    &#38; Sanna, S. (2023). Vibrational properties of LiNbO3 and LiTaO3 under uniaxial
    stress. <i>Physical Review Materials</i>, <i>7</i>(2), Article 024420. <a href="https://doi.org/10.1103/physrevmaterials.7.024420">https://doi.org/10.1103/physrevmaterials.7.024420</a>
  bibtex: '@article{Singh_Pionteck_Reitzig_Lange_Rüsing_Eng_Sanna_2023, title={Vibrational
    properties of LiNbO3 and LiTaO3 under uniaxial stress}, volume={7}, DOI={<a href="https://doi.org/10.1103/physrevmaterials.7.024420">10.1103/physrevmaterials.7.024420</a>},
    number={2024420}, journal={Physical Review Materials}, publisher={American Physical
    Society (APS)}, author={Singh, Ekta and Pionteck, Mike N. and Reitzig, Sven and
    Lange, Michael and Rüsing, Michael and Eng, Lukas M. and Sanna, Simone}, year={2023}
    }'
  chicago: Singh, Ekta, Mike N. Pionteck, Sven Reitzig, Michael Lange, Michael Rüsing,
    Lukas M. Eng, and Simone Sanna. “Vibrational Properties of LiNbO3 and LiTaO3 under
    Uniaxial Stress.” <i>Physical Review Materials</i> 7, no. 2 (2023). <a href="https://doi.org/10.1103/physrevmaterials.7.024420">https://doi.org/10.1103/physrevmaterials.7.024420</a>.
  ieee: 'E. Singh <i>et al.</i>, “Vibrational properties of LiNbO3 and LiTaO3 under
    uniaxial stress,” <i>Physical Review Materials</i>, vol. 7, no. 2, Art. no. 024420,
    2023, doi: <a href="https://doi.org/10.1103/physrevmaterials.7.024420">10.1103/physrevmaterials.7.024420</a>.'
  mla: Singh, Ekta, et al. “Vibrational Properties of LiNbO3 and LiTaO3 under Uniaxial
    Stress.” <i>Physical Review Materials</i>, vol. 7, no. 2, 024420, American Physical
    Society (APS), 2023, doi:<a href="https://doi.org/10.1103/physrevmaterials.7.024420">10.1103/physrevmaterials.7.024420</a>.
  short: E. Singh, M.N. Pionteck, S. Reitzig, M. Lange, M. Rüsing, L.M. Eng, S. Sanna,
    Physical Review Materials 7 (2023).
date_created: 2023-10-11T09:06:56Z
date_updated: 2023-10-11T09:08:16Z
doi: 10.1103/physrevmaterials.7.024420
extern: '1'
intvolume: '         7'
issue: '2'
keyword:
- Physics and Astronomy (miscellaneous)
- General Materials Science
language:
- iso: eng
publication: Physical Review Materials
publication_identifier:
  issn:
  - 2475-9953
publication_status: published
publisher: American Physical Society (APS)
quality_controlled: '1'
status: public
title: Vibrational properties of LiNbO3 and LiTaO3 under uniaxial stress
type: journal_article
user_id: '22501'
volume: 7
year: '2023'
...