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

Foyevtsova, Kateryna; Valentí, Roser; Hirschfeld, P. J.

doi:10.1103/physrevb.79.144424

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

Journal Article · Mon Apr 20 00:00:00 EDT 2009 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/physrevb.79.144424· OSTI ID:2484109

Foyevtsova, Kateryna ^[1]; Valentí, Roser ^[2]; Hirschfeld, P. J. ^[3]

Goethe-Universität Frankfurt (Germany); Univ. of Florida, Gainesville, FL (United States)
Goethe-Universität Frankfurt (Germany)
University of Florida, Gainesville, FL (United States)

Recent scanning tunneling spectroscopy experiments have provided evidence that dopant impurities in high-T_c 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. Furthermore, we discuss some realistic cases and their relevance for theories of the pairing mechanism in the cuprates.

View Accepted Manuscript (DOE)

Research Organization:: University of Florida, Gainesville, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-05ER46236

OSTI ID:: 2484109

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 14 Vol. 79; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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