Abstract
There are two bulk superconducting phases, orthorhombic-I (δ ~ 0, Tc ~ 90 K) and orthorhombic-II (δ ~ 0.5, Tc ~ 60 K), in YBa2Cu3O7-δ system. The former has fully-lined-up Cu-O chains on the Cu1 plane, while the latter has alternately-lined-up Cu-O chains. It should be emphasized that the superconductivity becomes percolative (inhomogeneous superconductivity) for other ô values. These facts mean that the Tc is not a simple function of the carrier density but that it should be related to the local oxygen ordering on the Cu1 plane. In order to explain this point, a percolation model is proposed and the importance of local atomic ordering is discussed in connection with the very short coherence length of superconductivity.
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Kubo, Y., Igarashi, H. (1989). Orthorhombic-n Superstructure and Significance of Oxygen Ordering for Superconductivity in YBa2Cu3O7-δ . In: Kamimura, H., Oshiyama, A. (eds) Mechanisms of High Temperature Superconductivity. Springer Series in Materials Science, vol 11. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-74407-5_32
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DOI: https://doi.org/10.1007/978-3-642-74407-5_32
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