Electronic structure of the 1 x 1 YBa2Cu3O7/PrBa2Cu3O7 superlattice: A local-spin-density approximation with on-site Coulomb interaction.

Abstract

We performed self-consistent linear muffin-tin orbital atomic sphere approximation calculations of the electronic structure of the 1{times}1 YBa{sub 2}Cu{sub 3}O{sub 7}/PrBa{sub 2}Cu{sub 3}O{sub 7} (YBCO/PBCO) superlattice, based on the local-spin-density approximation with on-site Coulomb correlation. From our results, we can exclude that the experimentally observed depression of the critical temperature is originated intrinsically by a modification of the electronic structure of the CuO{sub 2} planes. We find that the charge transfer between YBCO and PBCO layers is one order lower than the value required to explain the strong depression of both the critical temperature {ital T}{sub {ital c}}(onset) and the zero-resistance transition temperature {ital T}{sup 0}{sub {ital c}}, within the hole-filling model. {copyright} {ital 1996 The American Physical Society.}