Abstract
The antiferromagnetic ground state of ${\mathrm{CuO}}_{2}$ layers is studied at the mean-field level within a slave-boson approach to a multiband Hubbard model which includes the ${\mathit{d}}_{\mathit{x}}^{2}$-${\mathit{y}}^{2}$ orbital for Cu and the ${\mathit{p}}_{\mathit{x}}$ and ${\mathit{p}}_{\mathit{y}}$ orbitals for O. The stability of the antiferromagnetism is tested by varying the separation \ensuremath{\Delta} between p- and d-hole energy levels and by allowing direct O-O hopping. Results for the effective exchange integral, the antiferromagnetic gap, the percentage of d character of holes at the Fermi level, and the Cu magnetic moment are discussed by varying \ensuremath{\Delta}.
Published Version
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