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Effective Hubbard model for Zn-doped CuO2 plane |
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| Authors: | Z. Kovacevic R. Hayn N.M. Plakida |
| Affiliation: | Faculty of Natural Science and Mathematics, University of Montenegro, 211, 81001, Podgorica, Yugoslavia Institute for Theoretical Physics, University of Technology Dresden, 01062, Dresden, Germany Joint Institute for Nuclear Research, 141980, Dubna, Russia |
| Abstract: | In the framework of the cell-perturbation method for the original p-d model an effective two-band Hubbard model for the CuO2 plane with Zn impurities is derived. Zn impurities are modelled by Wannir oxygen one-hole states at vacant Cu sites. The model is based on the results of band structure calculations carried out within the local-density approximation. Further reduction to an extended t-J model shows a large ferromagnetic superexchange interaction between the Cu spin with the nearest virtual oxygen spin in the Zn cell. Received 17 November 1998 |
| Keywords: | PACS. 71.27.+a Strongly correlated electron systems heavy fermions - 71.55.-i Impurity and defect levels - 74.72.-h High- compounds |
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