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- W1621377674 abstract "From the intensities of superstructure reflections the structure of the ortho-II phase in YBa2Cu3O6.51(5) (Tc=55.8 K) was derived by single crystal X-ray diffraction. In the basal plane of the 2a×b×c supercell the oxygen atoms order in alternating CuOCu and CuCu chains. The correlation lengths of the ortho-II domains are 68 Å, 520 Å, 65 Å in a, b, and c- direction. Due to the oxygen order Ba atoms are displaced in an antiferrodistortive way towards the CuO chains by 0.03 Å. In this way the Coulomb energy of the ortho-II structure is reduced. The antiferrodistortive displacements of the Ba atoms could be important for the superconducting pairing mechanism." @default.
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- W1621377674 date "1992-05-01" @default.
- W1621377674 modified "2023-10-16" @default.
- W1621377674 title "Barium displacements in the superconducting ortho-II phase of YBa2Cu3O6.51" @default.
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- W1621377674 doi "https://doi.org/10.1016/0921-4534(92)90663-w" @default.
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