Abstract
Metal-oxide superconductors commonly base on a perovskite-type structure. The standard perovskite BaTiO3 forms a body-centered cubic structure with Ba at the body-centered position, Ti at the corners of a cube and O at the edge-centered positions. This structure can be regarded as stack of Ti-O and Ca-O layers as well. Starting from this structure a vast of superconductors have been synthesized or even designed by replacing the d metal ion, doping on the Ba site, doubling the unit cell in one direction, inserting additional d metal ion-oxygen layers, tuning the chargecarrier concentration, e. g. by changing the oxygen stoichiometry, or all changes together. In this way, supercells with ordered stacking sequences along the c direction have created which become superconducting at temperatures up to 133 K, as for example in HgBa2Ca2Cu3O8+δ [1]. HgBa2Ca2Cu3O8+δ has a sandwich structure consisting of three CuO2 layers separated by Ca layers and embedded in a roll made of a Hg/Ba-O double layers. A common feature of most metal-oxide superconductors is the d metal ion-oxygen layer as a building block and its subtle influence on the electronic properties. Very often a strongly two-dimensional metal is observed with conductivity (and superconductivity) mainly within these layers.
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Goll, G. Metal-Oxide Superconductors. In: Unconventional Superconductors. Springer Tracts in Modern Physics, vol 214. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11010715_10
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DOI: https://doi.org/10.1007/11010715_10
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