Abstract
The temperature dependence of the Raman spectrum in LiNbO\(_3\) is investigated from 100 to 700 K. The various sources of asymmetry of Raman bands and artefacts are discussed before analyzing the temperature dependence of A\(_1\) and E first-order phonon lines. The phonon frequency downshift and damping increase on heating are interpreted in terms of normal volume expansion and third- and fourth-order anharmonic potentials. Anharmonic contributions are highly anisotropic and mainly explain the temperature dependences of both frequency and damping of A\(_1\) optical vibrational modes along the ferroelectric axis. Results are consistent with Caciuc et al. (Phys Rev B 61:8806, 2000) predictions.
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Notes
The Raman spectra are recorded in wavenumber \(\omega \) (units cm\(^{-1}\)) which is usually but improperly called “frequency” according to the concept of frequency of vibrational mode (phonon).
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Kokanyan, N., Chapron, D. & Fontana, M.D. Temperature dependence of Raman scattering and anharmonic properties in LiNbO\(_3\) . Appl. Phys. A 117, 1147–1152 (2014). https://doi.org/10.1007/s00339-014-8485-1
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DOI: https://doi.org/10.1007/s00339-014-8485-1