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Glasslike phonon excitation caused by ferroelectric structural instability

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arxiv 2104.01969 v1 pith:FI77IFNI submitted 2021-04-05 cond-mat.mtrl-sci cond-mat.other

Y. Ishii , A. Yamamoto , N. Sato , Y. Nambu , S. Ohira-Kawamura , N. Murai , T. Mori , S. Mori This is my paper · ORCID
classification cond-mat.mtrl-scicond-mat.other
keywords excitationphasephononferroelectricglasslikeinstabilitystructuralacoustic
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Quest for new states of matter near an ordered phase is a promising route for making modern physics forward. By probing thermal properties of a ferroelectric (FE) crystal Ba1-xSrxAl2O4, we have clarified that low-energy excitation of acoustic phonons is remarkably enhanced with critical behavior at the border of the FE phase. The phonon spectrum is significantly damped toward the FE phase boundary and transforms into glasslike phonon excitation which is reminiscent of a boson peak. This system thus links long-standing issues of amorphous solids and structural instability in crystals to pave the way to controlling lattice fluctuation as a new tuning parameter.

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