Structure-Property Relations in High-Temperature Oxide Superconductors: Nature of Oxygen and Copper
Important structural aspects of the following families of perovskite-related superconductors are presented: La2-xSrx(Bax)Cu04, LnBa2Cu307, AmCan-xBxCun-102n+4 (A=T1, m=1,2; A=Bi, m=2; B=Ba,Sr). The nature of copper and oxygen in these oxide superconductors is discussed and it will be shown that oxygen holes (01- or 0 2 2- ) and Cu1+ ions play a crucial role in the superconductivity of the cuprates. Oxygen holes are likely to be present in many other oxides purported to contain metal ions such as Cu, Ni and Bi in high oxidation states; this seems to be the case with copper-free bismuth oxide superconductors as well.
KeywordsCUPRATE Superconductor Oxide Superconductor Structural Chemistry Unit Oxygen Hole Defect Perovskite
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