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Publications::
Turner, S.;Lebedev, O I.;Verbeeck, J.;Gehrke, K.; Moshnyaga, V.; Van Tendeloo, G. Structural phase transition and spontaneous interface reconstruction in La_{2/3}Ca_{1/3}MnO_{3}/BaTiO_{3} superlattices Phys. Rev. B 87 (2013), 035418 (La2/3Ca1/3MnO3)n/(BaTiO3)m (LCMOn/BTOm) superlattices on MgO and SrTiO3 substrates with different
layer thicknesses (n = 10, 38, 40 and m = 5, 18, 20) have been grown by metal organic aerosol deposition
(MAD) and have been fully characterized down to the atomic scale to study the interface characteristics. Scanning
transmission electron microscopy combined with spatially resolved electron energy-loss spectroscopy provides
clear evidence for the existence of atomically sharp interfaces in MAD grown films, which exhibit epitaxial
growth conditions, a uniform normal strain, and a fully oxidized state. Below a critical layer thickness the LCMO
structure is found to change from the bulk Pnma symmetry to a pseudocubic R¯3c symmetry. An atomically flat
interface reconstruction consisting of a single Ca-rich atomic layer is observed on the compressively strained
BTO on LCMO interface, which is thought to partially neutralize the total charge from the alternating polar
atomic layers in LCMO as well as relieving strain at the interface. No interface reconstruction is observed at the
tensile strained LCMO on BTO interface. View/Download |
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