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Title: Microstructure and dielectric relaxor properties for Ba₀.₅Sr₀. ₅TiO₃/La₀.₆₇Sr₀.₃₃MnO₃heterostructure
Authors: Miao, J
Tian, H
Zhou, X
Pang, GKH
Wang, Y 
Issue Date: 15-Apr-2007
Source: Journal of applied physics, 15 Apr. 2007, v. 101, no. 8, 084101, p. 1-6
Abstract: Ferroelectric and magnetoresistance heterostructure (Ba,Sr)TiO₃/ (La,Sr)MnO₃(BST/LSMO) heterostructure is deposited epitaxially on SrTiO₃(001) substrate by pulse laser deposition. The phase structures of the BST/LSMO heterostructure are characterized by x-ray diffraction. Cross-sectional transmission electron microscope shows a substantial interdiffusision between BST and LSMO layers. The dielectric properties and conductivity of BST/LSMO heterostructure is measured as a function of temperature, frequency, and electric field. The dielectric constant dependence on electric field, ε vs E, exhibits a strong nonlinear behavior in the temperature from 20 to 300 K, while ε [sub(E=0)] vs T relation shows a dielectric relaxor characteristic. Furthermore, the dielectric constant (E=0 kV/cm) and the dielectric tunability (E=200 kV/cm) are found to be similar temperature dependencies. Last, in the temperature regime where a semiconduction-type conduction became dominate, the activation thermal energy of BST/LSMO heterostructure is estimated to be 0.67 and 0.73 eV at 1 kHz and 1 MHz, respectively.
Keywords: Barium compounds
Crystal microstructure
Strontium compounds
Lanthanum compounds
Relaxor ferroelectrics
Colossal magnetoresistance
Ferroelectric thin films
Pusled laser deposition
X-ray diffraction
Transmission electron microscopy
Chemical interdiffusion
Permittivity
Publisher: American Institute of Physics
Journal: Journal of applied physics 
ISSN: 0021-8979
EISSN: 1089-7550
DOI: 10.1063/1.2721393
Rights: © 2007 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in J. Miao et al., J. Appl. Phys. 101, 084101 (2007) and may be found at http://link.aip.org/link/?jap/101/084101.
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