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

0477679 - FZÚ 2018 RIV US eng J - Článek v odborném periodiku
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
Grant CEP: GA ČR GA15-04121S
Institucionální podpora: RVO:68378271
Klíčová slova: ferroelectric domain walls * bismuth ferrite * terahertz spectroscopy * phonons * dielectric permittivity
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 8.839, rok: 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.

Trvalý link: http://hdl.handle.net/11104/0273960