Disorder origin of Raman scattering in perovskite single crystals

Matan Menahem, Nimrod Benshalom, Maor Asher, Sigalit Aharon, Roman Korobko, Olle Hellman, Omer Yaffe

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The anharmonic lattice dynamics of oxide and halide perovskites play a crucial role in their mechanical and optical properties. Raman spectroscopy is one of the key methods used to study these structural dynamics. However, despite decades of research, existing interpretations cannot explain the temperature dependence of the observed Raman spectra. We demonstrate the nonmonotonic evolution with temperature of the scattering intensity and present a model for second-order Raman scattering that accounts for this unique trend. By invoking a low-frequency anharmonic feature, we are able to reproduce the Raman spectral line shapes and integrated intensity temperature dependence. Numerical simulations support our interpretation of this low-frequency mode as a transition between two minima of a double-well potential surface. The model can be applied to other dynamically disordered crystal phases, providing a better understanding of the structural dynamics, leading to favorable electronic, optical, and mechanical properties in functional materials.

Original languageEnglish
Article number044602
JournalPhysical Review Materials
Volume7
Issue number4
DOIs
StatePublished - Apr 2023
Externally publishedYes

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© 2023 American Physical Society.

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