Influence of finite Hund rules and charge transfer on properties of Haldane systems

Details Influence of finite Hund rules and charge transfer on properties of Haldane systems Influence of finite Hund rules and charge transfer on properties of Haldane systems

1999-01-21

arxiv.org/abs/cond-mat/9901220v1

Physics

Condensed Matter

6 pages in RevTeX, 8 ps figures. Accepted to be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.59.9916

We consider the Kondo-Hubbard model with ferromagnetic exchange coupling $% J_{H}$, showing that it is an approximate effective model for late transition metal-O linear systems. We study the dependence of the charge and spin gaps $\Delta_{C}$, $\Delta_{S}$, and several spin-spin correlation functions, including the hidden order parameter $Z(\pi)$, as functions of $J_{H}/t$ and $U/t$, by numerical diagonalization of finite systems. Except for $Z(\pi)$, all properties converge slowly to the strong-coupling limit. When $J_{H}/t\sim 2$ and $U/t\sim 7$ (the effective parameters that we obtain for Y_2BaNiO_5), $\Delta_{S}$ is roughly half of the value expected from a strong-coupling expansion.

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