TY - JOUR

T1 - Anharmonicity of BaTiO3 single crystals

AU - Wang, Y. L.

AU - Tagantsev, A. K.

AU - Damjanovic, D.

AU - Setter, N.

AU - Yarmarkin, V. K.

AU - Sokolov, A. I.

N1 - Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2006

Y1 - 2006

N2 - By analyzing the dielectric nonlinearity with the Landau thermodynamic expansion, we find a simple and direct way to assess the importance of the eighth-order term. Following this approach, it is demonstrated that the eighth-order term is essential for the adequate description of the paraelectric-ferroelectric phase transition of BaTiO3. The temperature dependence of the quartic coefficient β is accordingly reconsidered and is strongly evidenced by the change of its sign above 165°C. All these findings attest to the anomalously strong polarization anharmonicity of this material, which is unexpected for classical displacive ferroelectrics.

AB - By analyzing the dielectric nonlinearity with the Landau thermodynamic expansion, we find a simple and direct way to assess the importance of the eighth-order term. Following this approach, it is demonstrated that the eighth-order term is essential for the adequate description of the paraelectric-ferroelectric phase transition of BaTiO3. The temperature dependence of the quartic coefficient β is accordingly reconsidered and is strongly evidenced by the change of its sign above 165°C. All these findings attest to the anomalously strong polarization anharmonicity of this material, which is unexpected for classical displacive ferroelectrics.

UR - http://www.scopus.com/inward/record.url?scp=33646374667&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.73.132103

DO - 10.1103/PhysRevB.73.132103

M3 - Article

VL - 73

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 13

M1 - 132103

ER -