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We report on the dielectric response of epitaxial BaSnO3 films grown on Nb-doped SrTiO3 (001) substrates using a hybrid molecular beam epitaxy approach. Metal-insulator-metal capacitors were fabricated to obtain frequency- and temperature-dependent dielectric constant and loss. Irrespective of film thickness and cation stoichiometry, the dielectric constant obtained from Ba1-xSn1-yO3 films remained largely unchanged at 15-17 and was independent of frequency and temperature. A loss tangent of ∼1 × 10-3 at 1 kHz < f < 100 kHz was obtained for stoichiometric films, which increased significantly with non-stoichiometry. Using density functional theory calculations, these results are discussed in the context of point defect complexes that can form during film synthesis.
Bibliographical noteFunding Information:
This work was primarily supported by the National Science Foundation through No. DMR-1741801 and partially by the UMN MRSEC program under Award No. DMR-1420013. A part of this work was supported through the Young Investigator Program of the Air Force Office of Scientific Research (AFOSR) through Grant No. FA9550-16-1-0205.
The authors thank Richard D. James, Hanlin Gu, and Nini Pryds for helpful discussion. W.N. thanks Matt Robbins for help with impedance measurements and training. This work was primarily supported by the National Science Foundation through No. DMR-1741801 and partially by the UMN MRSEC program under Award No. DMR-1420013. A part of this work was supported through the Young Investigator Program of the Air Force Office of Scientific Research (AFOSR) through Grant No. FA9550-16-1-0205. The work also acknowledges partial support from the RDF Fund of the Institute on the Environment (UMN). Parts of this work were carried out at the Minnesota Nano Center and Characterization Facility, University of Minnesota, which receives partial support from NSF through the MRSEC program. A.P. would like to acknowledge the support from the UMN Doctoral Dissertation Fellowship. For DFT work, J.M.G.L. acknowledges funding support from the Villum Foundation’s Young Investigator Programme through the Mat4Bat project (Grant No. 10096).
© 2018 Author(s).
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