Spectroscopic signature of sublattice polarization in the lattice dynamics of an antiferroelectric crystal

Anti ferroelectrics; Far infrared; Lows-temperatures; Measurements of; Phonon dynamics; Polar phasis; Soft modes; Spectroscopic measurements; Spectroscopic signatures; Sub-lattices; Physics and Astronomy (all); General Physics and Astronomy

Abstract :

[en] Spectroscopic measurements of the far-infrared phonon dynamics for a model antiferroelectric crystal are performed at low temperature. In agreement with the phenomenological expectations for a displacive antiferroelectric transition, a polar soft mode associated to a close-lying polar phase of the otherwise centrosymmetric structure is observed. Incomplete softening of the polar soft mode due to the antiferroelectric transition quantifies the energy barrier between the neighboring states. The dynamics are modeled with a biquadratic Landau potential incorporating a symmetry constraining effective interaction between displaced ions. A signature of sublattice polarization is observed in a scaling of the effective antipolar interaction in the antiferroelectric phase.

Disciplines :

Physics

Author, co-author :

Constable, E. ; Institute of Solid State Physics, TU Wien, Vienna, Austria

Bergen, L. ; Institute of Solid State Physics, TU Wien, Vienna, Austria

Shuvaev, A. ; Institute of Solid State Physics, TU Wien, Vienna, Austria

Wettstein, J. ; Institute of Solid State Physics, TU Wien, Vienna, Austria

Weymann, L. ; Institute of Solid State Physics, TU Wien, Vienna, Austria

Malysheva, E.; Institute of Solid State Physics, TU Wien, Vienna, Austria

Pimenov, A. ; Institute of Solid State Physics, TU Wien, Vienna, Austria

GUENNOU, Mael ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)

External co-authors :

yes

Language :

English

Title :

Spectroscopic signature of sublattice polarization in the lattice dynamics of an antiferroelectric crystal

Publication date :

2023

Journal title :

Physical Review Research

eISSN :

2643-1564

Publisher :

American Physical Society

Volume :

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://link.aps.org/article/10.1103/PhysRevResearch.5.L012036

Funders :

Austrian Science Fund

Funding text :

We acknowledge H. Berger for growing the single-crystal francisite samples. We thank M. Ryzhkov for helpful discussions on the capacitive measurements. This work was financially supported by the Austrian Science Fund (Project No. P 32404-N27).

Available on ORBilu :

since 22 December 2023

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