Work

Phenomenological theory with nonlocal electrostatics for non-Ising polarization switching and domain walls in LiNbO 3 and LiTaO 3

Year: 2025

Type: article

Abstract: We develop the Ginzburg-Landau-Devonshire phenomenological model for trigonal ferroelectrics, which matches experimental values of the poling electric field for both near-stoichiometric and congruent compounds. The model favors a non-Ising type of polarization switching. Therefore, domain walls have nontrivial Néel and/or Bloch polarization components supported by numerical computations. Néel and/or Bloch polarization components are of the order from 1 to 10% of spontaneous polarization in the model. Numerically calculated optimal domain wall profile has bichiral Bloch behavior for near-stoichiometric LiTaO 3 and LiNbO 3 and congruent lithium niobate. The domain wall has a mixed Bloch-Néel type without including electrostatic interactions and has a Bloch character when nonlocal electrostatic interactions are accounted for in congruent lithium tantalate.

Source: Physical review. B./Physical review. B

DOI: 10.1103/my4b-t3gv

Authors: Anton Talkachov, Egor Babaev

Institution: KTH Royal Institute of Technology

Language: English

Topic: Ferroelectric and Piezoelectric Materials

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Funders: Carl Tryggers Stiftelse för Vetenskaplig Forskning, Knut och Alice Wallenbergs Stiftelse, Vetenskapsrådet, Wallenberg Center for Quantum Technology, Chalmers University of Technology

Awards: G2117729710, Electron quadrupling condensates