Calculation of hole distribution in YBa2Cu3O7-�� and its correlation with superconductivity

The combinative energy in the YBa2Cu3O7-?? with the different ?? value, from 0.07 to 0.62, was calculated based on two-block model. In order to compensate for the deficiency of the ionic model for the YBa2Cu3O7-??, some holes were directly put on the different planes in the YBa2Cu3O7-??. When the holes are on the Cu(2)-O plane, the calculated result is perfectly consistent with the fact that the carriers mainly concentrate on the Cu(2)-O plane. When the holes are on the Cu(1)-O plane, The combinative energy shows the same trend as that on the Cu(2)-O plane, but the plateau in the range of ?? approx. 0.35 - 0.55 is different. When the holes are on the Ba-O plane, the relationship between the combinative energy and the oxygen deficiency is ambiguous. The calculation of the holes on different planes supplies abundant information about the charge distribution in the YBa2Cu3O7-??.EII/-341-34