On the stereochemistry of cations in the doping block of superconducting copper oxides |
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Authors: | J Röhler |
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Affiliation: | (1) European Synchrotron Radiation Facility, B.P. 220, F-38043 Grenoble, France |
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Abstract: | Metal-oxygen complexes containing Cu, Tl, Hg, Bi, and Pb cations are electronically active in superconducting copper oxides by stabilizing single phases with enhancedT
c, whereas other metal-oxygen complexes deteriorate copper oxide superconductivity. Cu. Tl, Hg, Bi, and Pb in their actual oxidation states are closed-shelld
10 or inerts
2 pair ions. Their electronic configurations have a strong tendency to polarize the oxygen environment. The closed shelld ions with low-lyingnd
10 nd
9(n+1)s excitations form linear complexes through
hybridization polarizing the apical oxygens. Comparatively lownd
9(n+1)s excitation energies distinguish Cu1+,3+, Tl3+, Hg2+, from other closed-shelld
10 ions deteriorating copper oxide superconductivity, e.g., Zn2+. |
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Keywords: | Copper oxides stereochemistry |
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