Copyright 2005, American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

The following article appeared in Appl. Phys. Lett. 87, 102906 (2005) and may also be found at http://link.aip.org/link/?APL/87/102906 .

S.M. Nakhmanson, K.M. Rabe, and David Vanderbilt, Polarization enhancement in two- and three-component ferroelectric superlattices (in PDF format).

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