Landau-Ginzburg-Devonshire theory of the chiral phase transition in 180.sup.◦./sup. domain walls of PbTiO.sub.3./sub.

0576990 - FZÚ 2024 RIV US eng J - Článek v odborném periodiku
Rychetský, Ivan - Schranz, W. - Troester, A.
Landau-Ginzburg-Devonshire theory of the chiral phase transition in 180^◦ domain walls of PbTiO₃.
Physical Review B. Roč. 108, č. 10 (2023), č. článku 104107. ISSN 2469-9950. E-ISSN 2469-9969
Grant CEP: GA MŠMT(CZ) EF16_019/0000760
Grant ostatní: OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institucionální podpora: RVO:68378271
Klíčová slova: dielectric properties * domain walls * ferroelectricity * electrostriction * phase transition
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 3.7, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1103/PhysRevB.108.104107

A new mechanism leading to a switchable Bloch-type polarization in a domain wall separating two ferroelectric domain states is proposed. A biquadratic coupling of the primary order parameter and its gradient originating from inhomogeneous electrostriction triggers the chiral phase transition (Ising-to-Bloch) in the domain walls (DW) with softening of the local polar mode and anomalous increase of the dielectric susceptibility at the phase transition temperature TDW<Tc. This mechanism describes the origin and properties of the polar Bloch component, which appears below TDW additionally to the antipolar Néel component in the 180° DW of PbTiO3. The tensile strain of the DW plane promotes the development of the Bloch polarization.
Trvalý link: https://hdl.handle.net/11104/0346422