EUROPEAN MULTIFUNCTIONAL MATERIALS INSTITUTE
| Improper ferroelectricity in perovskite oxide artificial superlattices |
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A multilayer structure, composed of alternating atomically thin layers of two different oxides, possesses properties radically different to either of the two materials by themselves.
Nature 10 April 2008 ; 452 (7188) 732-736 The Materials Physics group in Liege, together with colleagues from University Geneva and Stony Brook University, New York, have revealed a new artificial material that marks the beginning of a revolution in the development of materials for electronic applications. The new material, a superlattice, which has a multilayer structure composed of alternating atomically thin layers of two different oxides (PbTiO3 and SrTiO3), possesses properties radically different to either of the two materials by themselves. These new properties are a direct consequence of the artificially layered structure and are driven by interactions at the atomic scale at the interfaces between the layers. Besides the immediate applications that could be generated by this nanomaterial, this discovery opens a completely new field of investigation and the possibility of new functional materials based on a new concept: interface engineering on the atomic scale. |
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