| Autor: |
Klotins, Eriks, Popov, Anatoli, Pankratov, Vladimir, Shirmane, Liana, Engers, Davis |
| Zdroj: |
Central European Journal of Physics; Apr2011, Vol. 9 Issue 2, p438-445, 8p |
| Abstrakt: |
We report construction of a model of polar nanoregions in the PMN relaxor ferroelectric based on first-principles lattice dynamics for chemically ordered supercells [S.A. Prosandeev et al., Phys. Rev. B 70, 134110 (2004)], combined with invariance under permutations and dipole-dipole interaction as a source supporting randomly oriented residual polarization. Representative analytical estimates of polar nanore-gion - supercell mapping reproduce both nonzero local and zero macroscopic polarization of the structure, as well as the temperature change of the supercell anisotropy at cooling and field cooling. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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