Abstract
Electronic structure of La2−x Ba x CuO4 superconductors has been studied. Model systems La10CuO 22 −12 , La10cuO 14 +4 and LagBaCuO 14 +3 with various Ba positions have been investigated using the quasirelativistic INDO molecular orbital method. The oxidation state of copper atoms corresponds to Cu(II). The influence of Ba/La substitution on copper atoms is much lower than on their oxygen ligands sphere.
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