We present a numerical study of the two-dimensional double band Hubbard model on a twelve-site cluster simulating a copper-oxygen layer. The ground state is antiferromagnetic but magnetic ordering is greatly reduced by doping the cluster with extra holes. The presence of a positive extended-singlet pairing correlation supports a magnetic mechanism for an attractive interaction between holes on second neighbour oxygen sites.
Exact diagonalization of a two-dimensional double band Hubbard model on a twelve-site CuO cluster
La Magna Antonino;
1993
Abstract
We present a numerical study of the two-dimensional double band Hubbard model on a twelve-site cluster simulating a copper-oxygen layer. The ground state is antiferromagnetic but magnetic ordering is greatly reduced by doping the cluster with extra holes. The presence of a positive extended-singlet pairing correlation supports a magnetic mechanism for an attractive interaction between holes on second neighbour oxygen sites.File in questo prodotto:
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