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• W2019930700 abstract "Abstract The dependence of the superconducting properties of YBa 2 Cu 3 O 6+ y on the oxygen content y is discussed in terms of a two-phase model in which it is assumed that the optimal hole concentration, p opt = 0.25 per CuO 2 unit, is a local condition and that the average hole concentration p smaller than p opt results in phase separation into superconducting and insulating phases. For y = 1, p = p opt is satisfied everywhere in the CuO 2 plane and the material is a homogeneous bulk superconductor. As p decreases with decreasing y , the fraction of the insulating phase increases and superconductivity takes place through a 2D percolative network. Macroscopic superconductivity is lost when the insulating phase forms an infinite cluster. It is argued that the oxygen ions in the CuO y plane affect the cuperconducting properties not only by controlling p but also by modifying the hole distribution in the CuO 2 plane through local structural changes and long-range Coulomb interaction. Explanations are given of the two-plateau structure in the T c versus y curve and of the appearance of the seemingly homogeneous “60 K phase” at y ∼0.5-0.6. The relevance of the two-phase model to other systems and the origin of the phase separation are also discussed." @default.
• W2019930700 created "2016-06-24" @default.
• W2019930700 creator A5034595841 @default.
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• W2019930700 date "1995-05-01" @default.
• W2019930700 modified "2023-09-29" @default.
• W2019930700 title "Charge transfer, phase separation and percolative superconductivity in YBa2Cu3O6+y" @default.
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• W2019930700 doi "https://doi.org/10.1016/0921-4534(95)00167-0" @default.
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