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- W161255212 abstract "Neutron diffraction was used to determine the structural properties of oxygen deficient ${mathrm{NdBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{ensuremath{delta}}}$ for 0.090.74. It was found that superconductivity disappears at the orthorhombic-to-tetragonal phase transition which occurs at ${mathrm{ensuremath{delta}}}_{mathit{O}mathit{T}}$=0.45. Structural parameters vary smoothly with ensuremath{delta} but exhibit a change in slope at the orthorhombic-to-tetragonal transition. The structural properties exhibit the same features found in ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{ensuremath{delta}}}$ where ${mathrm{ensuremath{delta}}}_{mathit{O}mathit{T}}$=0.65. It is shown that the repulsion energy of oxygen atoms in the O(1) and O(5) sites in ${mathrm{NdBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{ensuremath{delta}}}$ is smaller than in ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{ensuremath{delta}}}$. This lower repulsion energy stabilizes the orthorhombic phase at lower values of ensuremath{delta}. It is argued that the disappearance of superconductivity at the orthorhombic-to-tetragonal transition is an inherent property of the R${mathrm{Ba}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{ensuremath{delta}}}$ (R denotes rare earth) system." @default.
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- W161255212 date "1990-03-01" @default.
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- W161255212 title "Structural and superconducting properties of oxygen-deficient<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>NdBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></…" @default.
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- W161255212 doi "https://doi.org/10.1103/physrevb.41.4173" @default.
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