---
res:
  bibo_abstract:
  - 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.@eng
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Ekta
      foaf_name: Singh, Ekta
      foaf_surname: Singh
  - foaf_Person:
      foaf_givenName: Mike N.
      foaf_name: Pionteck, Mike N.
      foaf_surname: Pionteck
  - foaf_Person:
      foaf_givenName: Sven
      foaf_name: Reitzig, Sven
      foaf_surname: Reitzig
  - foaf_Person:
      foaf_givenName: Michael
      foaf_name: Lange, Michael
      foaf_surname: Lange
  - foaf_Person:
      foaf_givenName: Michael
      foaf_name: Rüsing, Michael
      foaf_surname: Rüsing
      foaf_workInfoHomepage: http://www.librecat.org/personId=22501
    orcid: 0000-0003-4682-4577
  - foaf_Person:
      foaf_givenName: Lukas M.
      foaf_name: Eng, Lukas M.
      foaf_surname: Eng
  - foaf_Person:
      foaf_givenName: Simone
      foaf_name: Sanna, Simone
      foaf_surname: Sanna
  bibo_doi: 10.1103/physrevmaterials.7.024420
  bibo_issue: '2'
  bibo_volume: 7
  dct_date: 2023^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/2475-9953
  dct_language: eng
  dct_publisher: American Physical Society (APS)@
  dct_subject:
  - Physics and Astronomy (miscellaneous)
  - General Materials Science
  dct_title: Vibrational properties of LiNbO3 and LiTaO3 under uniaxial stress@
...