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Quasi-two-dimensional ferroelectricity in KNbO3/KTaO3 superlattices

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Abstract

First-principles density functional theory is used to calculate the phonon spectrum in the paraelectric phase, the ground-state structure and polarization distribution in the polar phase, and energies of ferro- and antiferroelectrically ordered phases of free-standing (KNbO3)1(KTaO3) n ferroelectric superlattices with n = 1–7. It is established that quasi-two-dimensional ferroelectricity with polarization oriented in the layer plane, which weakly interacts with polarization in neighboring layers, appears in potassium niobate layers with a thickness of one unit cell in the superlattices. The possibility of using of such ferroelectric superlattices as a medium for three-dimensional information recording is shown.

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Authors and Affiliations

  1. Moscow State University, Moscow, 119991, Russia

    A. I. Lebedev

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  1. A. I. Lebedev
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Correspondence to A. I. Lebedev.

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Original Russian Text © A.I. Lebedev, 2011, published in Fizika Tverdogo Tela, 2011, Vol. 53, No. 12, pp. 2340–2344.

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Lebedev, A.I. Quasi-two-dimensional ferroelectricity in KNbO3/KTaO3 superlattices. Phys. Solid State 53, 2463–2467 (2011). https://doi.org/10.1134/S1063783411120122

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