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arXiv · 2604.15156

Lattice dynamics and complete polarization analysis of Raman-active modes in LaInO$_3$

Jonas Rose·Hai Nguyen·Moritz Meißner·Zbigniew Galazka·Roland Gillen·Georg Hoffmann·Oliver Brandt·Manfred Ramsteiner·Markus R. Wagner·Hans Tornatzky
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Abstract

In this study, we present a comprehensive analysis of the Raman active phonon modes in orthorhombic LaInO$_3$ 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 $\Gamma$-point phonons to their irreducible representations of the D$_{\rm{2h}}$ 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, and atomic displacement patterns, which are found to be in good agreement with the experimental mode frequencies.

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Jonas Rose, Hai Nguyen, Moritz Meißner, Zbigniew Galazka, Roland Gillen, Georg Hoffmann, Oliver Brandt, Manfred Ramsteiner, Markus R. Wagner, Hans Tornatzky. 2026-04-16. Lattice dynamics and complete polarization analysis of Raman-active modes in LaInO$_3$. https://arxiv.org/abs/2604.15156

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