Oxygen diffusion in 123-YBCO

The problem of oxygen diffusion in 123-YBCO is discussed. We briefly recall the type of experiments, their results and theoretical interpretations. We observe the large spread of data values. The tracer diffusion coefficient interpretation is based on the ASYmmetric Next Nearest Neighbor Ising model and its phase diagram. Inclusion of oxygen-vacancy next nearest neighbor (NNN) hopping in the basal planes of YBCO leads to reconciling experimental data and theory. We also observe that the newly found V-Λ transition in the tracer diffusion coefficient at low temperature can be a source of interesting effects including the mark of superconductivity onset.

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