Key role of polar nanoregions in the cubic-to-tetragonal phase transition of potassium-based perovskites

Jacopo Parravicini*, Eugenio Delre, Simone Perego, Maurizio Acciarri, Simona Binetti, Yehudit Garcia, Galina Parapelitsa, Aharon J. Agranat, Gianbattista Parravicini

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

We investigate samples of compositionally disordered potassium-based perovskite single crystals with different composition and stoichiometry. The dielectric and Raman response is inspected over the nominal cubic-to-tetragonal long-range phase transition. The comparison between results shows that the occurrence of the phase transition is controlled by the temperature evolution of polar nanoregions (PNRs). We are able to correlate PNR order, formation, percolation, and freezing to the characteristic temperatures of each macroscopic crystal. The onset of the phase transition is found to occur when PNRs undergo a percolative ordering process, in correlation to the sudden arising of a specific high-frequency Raman mode.

Original languageAmerican English
Article number064107
JournalPhysical Review B
Volume106
Issue number6
DOIs
StatePublished - 1 Aug 2022

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© 2022 American Physical Society.

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