First-principles-based Landau-Devonshire potential for BiFeO.sub.3./sub.

0483344 - FZÚ 2018 RIV US eng J - Článek v odborném periodiku
Márton, Pavel - Klíč, Antonín - Pasciak, Marek - Hlinka, Jiří
First-principles-based Landau-Devonshire potential for BiFeO₃.
Physical Review B. Roč. 96, č. 17 (2017), s. 1-5, č. článku 174110. ISSN 2469-9950. E-ISSN 2469-9969
Grant CEP: GA ČR GA15-04121S
Grant ostatní: GA MŠk(CZ) LM2015042
Institucionální podpora: RVO:68378271
Klíčová slova: Landau-Devonshire potential * first-principles calculations * BiFeO3 * Energy-sampling technique
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 3.813, rok: 2017

The work describes a first-principles-based computational strategy for studying structural phase transitions, and in particular, for determination of the so-called Landau-Devonshire potential—the classical zero-temperature limit of the Gibbs energy, expanded in terms of order parameters. It exploits the configuration space attached to the eigenvectors of the modes frozen in the ground state, rather than the space spanned by the unstable modes of the high-symmetry phase, as done usually. This allows us to carefully probe the part of the energy surface in the vicinity of the ground state, which is most relevant for the properties of the ordered phase. We apply this procedure to BiFeO3 and perform ab initio calculations in order to determine potential energy contributions associated with strain, polarization, and oxygen octahedra tilt degrees of freedom, compatible with its two-formula unit cell periodic boundary conditions.

Trvalý link: http://hdl.handle.net/11104/0278699