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Lattice dynamics and complete polarization analysis of Raman-active modes in LaInO3

Jonas Rose1,*, Hai Nguyen1, Moritz Meißner1, Zbigniew Galazka2, Roland Gillen3, Georg Hoffmann1, Oliver Brandt1, Manfred Ramsteiner1, Markus R. Wagner1 et al.

Hans Tornatzky1,†

  • *Contact author: rose@pdi-berlin.de
  • †Contact author: tornatzky@pdi-berlin.de
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Phys. Rev. Materials 10, 094604 – Published 9 September, 2026

DOI: https://doi.org/10.1103/frdm-2plg

Abstract

In this study, we present a comprehensive analysis of the Raman-active phonon modes in orthorhombic LaInO3 based on a combination of polarization-angle resolved Raman spectroscopy and density functional theory calculations. By using backscattering from multiple crystallographic surface orientations and employing a full symmetry analysis, we identify and assign most of the Raman-active Γ-point phonons to their irreducible representations of the D2h point group. A multidimensional hyperspectral fitting procedure allows us to extract the relative Raman tensor elements from the angular dependence of the scattering intensities, even for strongly overlapping modes. First-principles calculations yield the phonon dispersion along high-symmetry directions, the phonon densities of states, atomic displacement patterns, and Raman tensor elements, which are found to be in good agreement with the experiment.

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Phys. Rev. Materials 10, 094604– Published 9 September, 2026
  • Received 17 April 2026
  • Accepted 31 July 2026
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