Abstract
OXYGEN ordering in YBa2Cu3Oz, is responsible for the tetragonal-to-orthorhombic phase transition at high temperature, and gives rise to additional ordered superstructures at low temperature1–3. We suggest here that such ordered superstructures are intimately related to the 'plateaus' in the plot of transition temperature versus oxygen content that have been observed by various investigators4,5. We present a consistent theoretical model for oxygen ordering in YBa2Cu3Oz, featuring a parameter-free phase diagram for this system and an algorithm for determining further ordered phases, the predicted structures and diffraction patterns of which agree closely with recent experimental findings2,3.
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de Fontaine, D., Ceder, G. & Asta, M. Low-temperature long-range oxygen order in YBa2Cu3Oz. Nature 343, 544–546 (1990). https://doi.org/10.1038/343544a0
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DOI: https://doi.org/10.1038/343544a0
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