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Unusual ground state structure of KNbO$_3$/KTaO$_3$ superlattices: Array of nearly independent ferroelectrically ordered planes | | Alexander I. Lebedev
; | | Date: |
4 Feb 2011 | | Abstract: | Phonon spectra of the paraelectric phase, structure and distribution of
polarization in the polar ground state, and energies of ferroelectrically and
antiferroelectrically ordered phases were calculated for stress-free
(KNbO$_3$)$_1$(KTaO$_3$)$_n$ superlattices ($n = {}$1--7) within the
density-functional theory. Two-dimensional ferroelectric state with the
polarization localized in the KNbO$_3$ layer was revealed to be the ground
state for the superlattices with $n ge 2$. The interaction between these
polarized layers decreases exponentially with increasing the interlayer
distance, and the ground state structure transforms to an array of nearly
independent ferroelectrically ordered planes at large $n$. | | Source: | arXiv, 1102.1001 | | Services: | Forum | Review | PDF | Favorites | |
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