Inter-site Coulomb interaction and Heisenberg exchange

Details Inter-site Coulomb interaction and Heisenberg exchange Inter-site Coulomb interaction and Heisenberg exchange

1996-05-19

arxiv.org/abs/cond-mat/9605117v1

Physics

Condensed Matter

Revtex file, 4 PRB pages, with 5 embedded ps-files. To appear in PRB, rapid communications. Hardcopies of figures or the entir

Scientific paper

10.1103/PhysRevB.54.R732

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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