Relaxor features in ferroelectric superlattices: A Maxwell-Wagner approach

Catalan, G.; O'Neill, D.; Bowman, R. M.; Bowman, R.M.; Gregg, J. M.; Gregg, J.M.
November 2000
Applied Physics Letters;11/6/2000, Vol. 77 Issue 19
Academic Journal
A Maxwell-Wagner series capacitor model is proposed to explain anomalous dielectric properties of ferroelectric superlattices. The results of the model show that a superlattice consisting of normal ferroelectric layers separated by low-resistivity interfacial regions can account for most experimental results reported to date, namely: dielectric enhancement for certain stacking periodicities, giant permittivities, and temperature migration of dielectric maxima as a function of frequency. The predictions of the model are discussed and compared to our own experimental results from thin film superlattice capacitors made by pulsed-laser deposition. © 2000 American Institute of Physics.


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