Abstract
Manganite film electrodes were integrated with a spacer layer of strontium titanate to produce an epitaxial La0.67Ca0.33MnO3/(1000 nm)SrTiO3/La0.67Ca0.33MnO3 (LCMO/STO/LCMO) heterostructure by laser ablation. At T = 300 K, the mechanical stresses in the STO layer relaxed to a considerable extent, while the LCMO electrodes were found to be under biaxial lateral tensile strain, with the lattice unit cell of the top electrode distorted considerably stronger (a ∥/a ⊥ ≈ 1.026) than that of the bottom electrode (≈1.008) (a ∥ and a ⊥ are the unit cell parameters in the substrate plane and along the normal to its surface, respectively). The reciprocal of the capacitance C of the plane-parallel LCMO/STO/LCMO film capacitors thus formed increased almost linearly with increasing temperature T in the range 50–250 K. At T < 100 K, the capacitance C decreased by approximately 50% in an electric field E = 40 kV/cm. After the electric field E was varied as 0 → + 100 kV/cm → 0, the capacitance C decreased by approximately 3% and the maximum in the C(E, T > 200 K) dependence shifted by approximately 9 kV/cm with respect to the point E = 0.
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Original Russian Text © Yu.A. Boĭkov, V.A. Danilov, 2010, published in Fizika Tverdogo Tela, 2010, Vol. 52, No. 7, pp. 1342–1346.
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Boĭkov, Y.A., Danilov, V.A. Response of the capacitance of a planar La0.67Ca0.33MnO3/SrTiO3/La0.67Ca0.33MnO3 heterostructure to an electric field. Phys. Solid State 52, 1439–1443 (2010). https://doi.org/10.1134/S106378341007019X
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DOI: https://doi.org/10.1134/S106378341007019X