Effective atomic charges and charge transport in superconductor lattices |
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Authors: | V F Masterov F S Nasredinov N P Seregin P P Seregin |
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Institution: | (1) St. Petersburg State Technical University, 195251 St. Petersburg, Russia |
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Abstract: | Effective atomic charges in Rba2Cu3O7 compounds (here R stands for yttrium or a rare-earth metal), Tl2Ba2Ca2Cu3O10, and Bi1.6Pb0.4Sr2Ca2Cu3O10 have been determined. In Rba2Cu3O7, the holes are shown to be delocalized primarily on the oxygen-chain sublattice. Two models of charge distribution within
the lattices of Tl2Ba2Ca2Cu3O10 and Bi1.6Pb0.4Sr2Ca2Cu3O10 are proposed, which assume the presence of holes at oxygen sites in the Cu(2)-O plane but differ in the occupation of the
3d shell of Cu atoms at the nodes of Cu(1). The atomic charges of Tl, Bi, and Cu(1) on these two latter lattices are possibly
controllable. The results obtained are shown to be qualitatively consistent with Hall measurements of the hole concentration
and of its temperature dependence in the compounds studied.
Fiz. Tverd. Tela (St. Petersburg) 39, 2118–2122 (December 1997) |
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