Improper ferroelectricity in perovskite oxide artificial superlattices

被引：0
作者：
Eric Bousquet
Matthew Dawber
Nicolas Stucki
Céline Lichtensteiger
Patrick Hermet
Stefano Gariglio
Jean-Marc Triscone
Philippe Ghosez
机构：
[1] Physique Théorique des Matériaux,
[2] Université de Liège,undefined
[3] Allée du 6 Août 17 (B5),undefined
[4] 4000 Sart Tilman,undefined
[5] Belgium,undefined
[6] DPMC,undefined
[7] University of Geneva,undefined
[8] 24 Quai E.-Ansermet 1211,undefined
[9] Geneva 4,undefined
[10] Switzerland,undefined
[11] Present address: Department of Physics and Astronomy,undefined
[12] Stony Brook University,undefined
[13] Stony Brook,undefined
[14] New York 11794-3800,undefined
[15] USA.,undefined
来源：
Nature | 2008年 / 452卷
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摘要：
In the field of 'oxide electronics', artificially layered structures based on thin films of complex oxides are designed to obtain novel, technologically interesting electric or magnetic properties. Bousquet et al. studied artificial superlattices made from ferroelectric (PbTiO3) and paraelectric (SrTiO3) oxides. They have found a previously unknown type of atom rearrangement at the interfaces between thin films of these materials, leading to an unusual 'improper' ferroelectric effect. The system has a very large dielectric constant that, unlike conventional ferroelectricity, is fairly temperature independent. This is of considerable technological interest as a route to improved materials for high-permittivity dielectric layers in traditional microelectronics as well as for emerging needs in magneto-electric applications.
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页码：732 / 736
页数：4
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