Ordering in high-Tcsuperconducting systems: Effective pair interactions in Y-Ba-Cu-O
- 1 February 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 43 (4) , 3768-3770
- https://doi.org/10.1103/physrevb.43.3768
Abstract
Effective pair interactions are examined in the nonstoichiometric as well as the Zn-doped Y-Ba-Cu-O systems in terms of the real-space-scattering-cluster coherent-potential approximation. Large negative pair energies are found for the first and second in-chain neighbors if vacancies occupy the O(1) sublattice, while concomitantly rather small positive pair energies characterize the interchain neighbors. Negative pair energies are also found for a disordered O(2) sublattice, if a copper atom bridges the two sites. This result is in good agreement with experiment and with other calculations. For the Zn-doped copper sublattices no such clear-cut behavior is observed with regard to the possible ordering of sites occupied by Cu or Zn atoms.Keywords
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