Piezoelectricity in the Dielectric Component of Nanoscale Dielectric-Ferroelectric Superlattices

作     者：Ji Young Jo Rebecca J. Sichel Ho Nyung Lee Serge M. Nakhmanson Eric M. Dufresne Paul G. Evans 

作者机构：Department of Materials Science and Engineering and Materials Science Program University of Wisconsin Madison Wisconsin 53706 USA Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Materials Science Division Argonne National Laboratory Argonne Illinois 60439 USA Advanced Photon Source Argonne National Laboratory Argonne Illinois 60439 USA 

出 版 物：《Physical Review Letters》 (Phys Rev Lett)

年 卷 期：2010年第104卷第20期

页      面：207601-207601页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：U.S. Department of Energy, Office of Basic Energy Sciences [DE-FG02-04ER46147] Division of Materials Sciences and Engineering, U.S. Department of Energy [DE-AC05-00OR22725] U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357] U.S. Department of Energy (DOE) [DE-FG02-04ER46147] Funding Source: U.S. Department of Energy (DOE) Division Of Materials Research Direct For Mathematical & Physical Scien Funding Source: National Science Foundation 

主　　题：X ray diffraction 

摘      要：The origin of the functional properties of complex oxide superlattices can be resolved using time-resolved synchrotron x-ray diffraction into contributions from the component layers making up the repeating unit. The CaTiO3 layers of a CaTiO3/BaTiO3 superlattice have a piezoelectric response to an applied electric field, consistent with a large continuous polarization throughout the superlattice. The overall piezoelectric coefficient at large strains, 54 pm/V, agrees with first-principles predictions in which a tetragonal symmetry is imposed on the superlattice by the SrTiO3 substrate.