Effect of dopant atoms on local superexchange in cuprate superconductors: a perturbative treatment

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dc.creatorFoyevtsova, Kateryna
dc.creatorValenti, Roser
dc.creatorHirschfeld, P. J.
dc.date2008-09-17
dc.date2009-04-21
dc.date.accessioned2026-07-07T13:06:11Z
dc.date.available2026-07-07T13:06:11Z
dc.descriptionRecent scanning tunneling spectroscopy experiments have provided evidence that dopant impurities in high- Tc superconductors can strongly modify the electronic structure of the CuO2 planes nearby, and possibly influence the pairing. To investigate this connection, we calculate the local magnetic superexchange J between Cu ions in the presence of dopants within the framework of the three-band Hubbard model, up to fifth-order in perturbation theory. We demonstrate that the sign of the change in J depends on the relative dopant-induced spatial variation of the atomic levels in the CuO2 plane, contrary to results obtained within the one-band Hubbard model. We discuss some realistic cases and their relevance for theories of the pairing mechanism in the cuprates
dc.description5 pages, 4 figures, revised version
dc.identifierhttps://arxiv.org/abs/0809.2919
dc.identifierhttp://arxiv.org/abs/0809.2919
dc.identifierPhys. Rev. B 79, 144424 (2009)
dc.identifierdoi:10.1103/PhysRevB.79.144424
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/227699
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleEffect of dopant atoms on local superexchange in cuprate superconductors: a perturbative treatment
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