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- W2056511812 abstract "We have studied the effect of thickness on the structure and superconductivity of ${mathrm{Nd}}_{1.2}{mathrm{Ba}}_{1.8}{mathrm{Cu}}_{3}{mathrm{O}}_{z}$ (NdBCO) epitaxial films deposited on $mathrm{Sr}mathrm{Ti}{mathrm{O}}_{3}$ (100) substrates. High-quality NdBCO films were deposited by high oxygen pressure sputtering. The samples have been carefully characterized by transport measurements and x-ray diffraction using conventional and synchrotron radiation sources. Two structural transformations are observed. The first one is a crossover from the orthorhombic and twinned structure, typical of thick samples, to a pseudotetragonal phase at thickness lower than 60 unit cells. The pseudotetragonal phase exhibits peculiar x-ray diffuse scattering around the Bragg reflections, associated with nanostructured twinned domains. The second one appears at a thickness lower than 20 unit cells and is assigned to a pseudotetragonal-tetragonal transition. The transport properties are not modified at the first crossover, while a substantial decrease in ${T}_{c}$ and in the number of holes is observed at the pseudotetragonal-tetragonal transformation. Our results suggest that the structural rearrangement and the transport properties are explained by the ordering of Cu(1)O chains. A simple model, able to explain the experimental results and capturing the essential features of the Cu(1)O chains nucleation process in the ${mathrm{R}}_{1+x}{mathrm{Ba}}_{2ensuremath{-}x}{mathrm{Cu}}_{3}{mathrm{O}}_{7ensuremath{-}ensuremath{delta}}$ ($mathrm{R}=mathrm{Y}$ and rare-earth elements) compounds, is presented." @default.
- W2056511812 created "2016-06-24" @default.
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- W2056511812 date "2005-10-25" @default.
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- W2056511812 title "Thickness effect on the structure and superconductivity of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mi>Nd</mml:mi><mml:mn>1.2</mml:mn></mml:msub><mml:msub><mml:mi>Ba</mml:mi><mml:mn>1.8</mml:mn></mml:msub><mml:msub><mml:mi>Cu</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mi>z</mml:mi></mml:msub></mml:mrow></mml:math>epitaxial films" @default.
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- W2056511812 doi "https://doi.org/10.1103/physrevb.72.134521" @default.
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