Glasslike phonon excitation caused by ferroelectric structural instability
Materials Science
2021-04-06 v1 Other Condensed Matter
Abstract
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.
Keywords
Cite
@article{arxiv.2104.01969,
title = {Glasslike phonon excitation caused by ferroelectric structural instability},
author = {Y. Ishii and A. Yamamoto and N. Sato and Y. Nambu and S. Ohira-Kawamura and N. Murai and T. Mori and S. Mori},
journal= {arXiv preprint arXiv:2104.01969},
year = {2021}
}
Comments
6 pages, 4 figures