Terahertz-range polar modes in domain-engineered BiFeO.sub.3./sub.

0477679 - FZÚ 2018 RIV US eng J - Journal Article
Hlinka, Jiří - Pasciak, Marek - Körbel, S. - Márton, Pavel
Terahertz-range polar modes in domain-engineered BiFeO₃.
Physical Review Letters. Roč. 119, č. 5 (2017), 1-6, č. článku 057604. ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA ČR GA15-04121S
Institutional support: RVO:68378271
Keywords : ferroelectric domain walls * bismuth ferrite * terahertz spectroscopy * phonons * dielectric permittivity
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 8.839, year: 2017

The dielectric permittivity and properties of electrically active lattice resonances in nanotwinned BiFeO3 crystals have been studied theoretically using an earlier established interatomic potential. The results suggest that an array of 71 degree domain walls with about 2-5 nm spacing enhances the static permittivity of BiFeO3 by more than an order of magnitude. This enhancement is associated with an electrically active excitation, corresponding to a collective vibration of pinned domain walls at a remarkably high frequency of about 0.3 THz.

Permanent Link: http://hdl.handle.net/11104/0273960