Range of the t--J model parameters for CuO$_{2}$ plane: experimental data constraints

Details Range of the t--J model parameters for CuO$_{2}$ plane: experimental data constraints Range of the t--J model parameters for CuO$_{2}$ plane: experimental data constraints

1994-07-04

arxiv.org/abs/cond-mat/9407016v2

Phys. Rev. B 50, 13768 (1994)

Physics

Condensed Matter

20pp., REVTEX 3.0, (11 figures), report 666

Scientific paper

10.1103/PhysRevB.50.13768

The t-J model effective hopping integral is determined from the three-band Hubbard model for the charge carriers in CuO$_{2}$ plane. For this purpose the values of the superexchange constant $J$ and the charge-transfer gap $E_{gap}$ are calculated in the framework of the three-band model. Fitting values of $J$ and $E_{gap}$ to the experimental data allows to narrow the uncertainty region of the three-band model parameters. As a result, the $t/J$ ratio of the t-J model is fixed in the range $2.4 \div 2.7$ for holes and $2.5 \div 3.0$ for electrons. Formation of the Frenkel exciton is justified and the main features of the charge-transfer spectrum are correctly described in the framework of this approach.

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