| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Validity of Nonlinear Thermodynamic Models in Ferroelectric-Paraelectric Bilayers and Superlattices |
| LIU Yang**,PENG Xing-Ping |
| Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000 |
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| Cite this article: |
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LIU Yang, PENG Xing-Ping 2012 Chin. Phys. Lett. 29 057701 |
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Abstract We examine the validity of nonlinear thermodynamic models which incorporate the contribution of electrostatic coupling and interfacial space charge in ferroelectric-paraelectric bilayers. Inconsistency of the directions between build-in polarization and field is found. Evolution of ferroelectricity does not follow the variation in coupling strength between different layers. In addition, we observe that the field-induced polarization in the paraelectric layer deviates from the polarization derived by thermodynamic theory. These findings indicate that the current versions of thermodynamic models need to be modified.
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Received: 23 December 2011
Published: 30 April 2012
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| PACS: |
77.55.Nv
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(Multiferroic/magnetoelectric films)
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77.80.B-
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(Phase transitions and Curie point)
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61.50.Ah
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(Theory of crystal structure, crystal symmetry; calculations and modeling)
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