Science and technology of advanced materials

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1468-69961712016Science and technology of advanced materialsSci Technol Adv MaterLongitudinal conductivity of LaF₃/SrF₂ multilayer heterostructures.799806799-806LaF₃/SrF₂ multilayer heterostructures with thicknesses of individual layers in the range 5-100 nm have been grown on MgO(100) substrates using molecular beam epitaxy. The longitudinal conductivity of the films has been measured using impedance spectroscopy in the frequency range 10^-1-10⁶ Hz and a temperature range 300-570 K. The ionic DC conductivities have been determined from Nyquist impedance diagrams and activation energies from the Arrhenius-Frenkel equation. An increase of the DC conductivity has been observed to accompany decreased layer thickness for various thicknesses as small as 25 nm. The greatest conductivity has been shown for a multilayer heterostructure having thicknesses of 25 nm per layer. The structure has a conductivity two orders of magnitude greater than pure LaF₃ bulk material. The increasing conductivity can be understood as a redistribution of charge carriers through the interface due to differing chemical potentials of the materials, by strong lattice-constant mismatch, and/or by formation of a solid La_1-xSr_xF_3-x solution at the interface during the growth process.VergentevTikhonTInstitute of Physics, Nanotechnology and Telecommunications, Peter the Great St. Petersburg Polytechnic University , Saint-Petersburg , Russia.BanshchikovAlexanderADivisions of Solid State Physics and Physics of Dielectric and Semiconductors, Ioffe Institute , Saint-Petersburg , Russia.FilimonovAlexeyAInstitute of Physics, Nanotechnology and Telecommunications, Peter the Great St. Petersburg Polytechnic University , Saint-Petersburg , Russia.KorolevaEkaterinaEInstitute of Physics, Nanotechnology and Telecommunications, Peter the Great St. Petersburg Polytechnic University, Saint-Petersburg, Russia; Divisions of Solid State Physics and Physics of Dielectric and Semiconductors, Ioffe Institute, Saint-Petersburg, Russia.SokolovNikolayNDivisions of Solid State Physics and Physics of Dielectric and Semiconductors, Ioffe Institute , Saint-Petersburg , Russia.WurzMarc ChristopherMCInstitute for Microproduction Technology, Leibniz University of Hanover , Garbsen , Germany.engJournal Article20161125

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