Inter-site Coulomb interaction and Heisenberg exchange

G. A. Sawatzky; J. van den Brink; R. Eder

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Inter-site Coulomb interaction and Heisenberg exchange

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arxiv cond-mat/9605117 v1 pith:JTFOL62Z submitted 1996-05-19 cond-mat

R. Eder , J. van den Brink , G. A. Sawatzky This is my paper · ORCID

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keywords inter-sitecoulombexchangemodelschargeinstabilityinteractionrepulsion

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Based on exact diagonalization results for small clusters we discuss the effect of inter-site Coulomb repulsion in Mott-Hubbard or charge transfer insulators. Whereas the exchange constant J for direct exchange is substantially enhanced by inter-site Coulomb interaction, that for superexchange is suppressed. The enhancement of J in the single-band models holds up to the critical value for the charge density wave (CDW) instability, thus opening the way for large values of J. Single-band Hubbard models with sufficiently strong inter-site repulsion to be near a CDW instability thus may provide `physical' realizations of t-J like models with the `unphysical' parameter ratio J/t=1.

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