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Dielectric response of asymmetric KNbO3/KTaO3 superlattices

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5 Author(s)
Sigman, J. ; Department of Materials Science and Engineering, University of Florida, P.O. Box 116400, Rhines Hall, Gainesville, Florida 32606 ; Bae, H.J. ; Norton, D.P. ; Budai, J.
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The synthesis and properties of asymmetric KNbO3/KTaO3 superlattices is examined. Interdigitated electrodes are fabricated for temperature-dependent capacitance measurements. The nonlinear dielectric response of 1/N superlattice exhibits the anomalous positive tunability behavior indicative of antiferroelectricity. In contrast, the N/1 KNbO3/KTaO3 structures (N≫1) appear to be either ferroelectric or paraelectric, depending on the temperature. Discussion of possible mechanisms for this behavior is given.

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Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films  (Volume:22 ,  Issue: 5 )