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Lead transition metal oxides: Globally alike, locally very diverse
Phys. Rev. B 113, 214106 – Published 15 June, 2026
DOI: https://doi.org/10.1103/4dlq-9mb1
Abstract
The lead transition metal oxides , and are shown to be extremely similar in their overall properties, such as soft-mode behavior, phase transitions, and long-wavelength related characteristics. However, locally, they develop very different qualities because, as the mass increases (where B ≡ Ti, Zr, Hf), the anharmonicity of each compound increases significantly, leading to the formation of intrinsically localized modes (ILMS) or discrete breathers (DBS). This explains their exceptionally flat transverse acoustic modes. These nonlinear excitations are observed in birefringence measurements, where their coexistence with the phonon spectrum is demonstrated. While the soft modes, whether normalized by mass or temperature (long-wavelength optic and zone boundary acoustic modes), follow nearly identical temperature dependencies, the transverse acoustic modes exhibit a highly dispersion-free momentum dependence, characteristic of ILMS or DBS. Crucially, our findings support the earlier notion that the unusual dynamics are solely due to the polarizable unit, with the Pb subarrays acting merely as spectators. Furthermore, these results provide a unique explanation for the appearance of the transient phase below the phase transitions of and , which appears to be intrinsic to these two compounds.
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