Abstract
This paper presents a calculation of the density of electronic states (DEE) of high critical temperature superconductors, NdBa2Cu3O7, SmBa2Cu3O7and and YBa2Cu3O7. The aim is to determine the effect of f orbitals of Sm and Nd atoms in total DEE, and partial ones. Calculations were performed with ab initio LAPW+lo method. The total DEE of the three systems are qualitatively similar, except for the region above the Fermi energy (Ef), which shows the contribution of forbitals of the rare earths. These contributions modify the partial DEE of CuO planes differently: for Nd123 there is a decrease in the contribution of the DEE, for an increase Sm123.References
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