We have studied the charge distribution on the new T* copper oxides Nd1.2Sr0.8-xY(Ln)xCuO4-δ (Ln = Ho, Er, Yb) by using the valence bond model and the structural information of these oxides. The results show an unequal distribution of charges with a strong delocalisation in the RS part of the structure with a small excess located in the fluorite and perovskite blocs. On the basis of results provided by the literature we can conclude that such a distribution is not favorable for a superconducting transition in these systems.
|Translated title of the contribution||Bondlength and valence bond in the new cuprates T * of Nd1.2Sr0.8-xY(Ln)xCuO4-δ (Ln = Ho, Er, Yb)|
|Number of pages||6|
|Journal||Revue Roumaine de Chimie|
|State||Published - Mar 2001|