3 citations · 8 across the 5 of their papers we have counts for
5 papers
Charge Transfer Excitons and Possible Exitonic Pairing in the Extended Three Band Hubbard Model
C. Vermeulen, W. Barford, E. R. Gagliano
Exact diagonalisations of the extended Hubbard model are performed. In the insulating regime it is shown that the nearest neighbour copper-oxygen repulsion, , leads to Frenkel e…
A Variational Estimate of the Binding Energy of Charge-Transfer Excitons in the Cuprate Superconductors.
C. Vermeulen, W. Barford
We present a variational estimate for the binding energy of a Frenkel exciton in the insulating cuprate superconductors. Starting from the three band Hubbard model we perform a can…
Phase Separation and Superconductivity in the Copper Oxide Chain
C. Vermeulen, W. Barford, E. R. Gagliano
The phase diagram of the copper-oxide chain as a function of density and the nearest-neighbour Coulomb interaction, V, is determined. Phase separation takes place above a critical…
Large Phase Separation and Superconductivity in the Copper Oxide Chain
C. Vermeulen, W. Barford, E. R. Gagliano
The phase diagram of the copper-oxide chain as a function of density and the nearest-neighbour Coulomb interaction, V, is determined. Phase separation takes place above a critical…
Charge Transfer Excitons and the Metal-Insulator Transition in the High Temperature Superconductors
C. Vermeulen, W. Barford, E. R. Gagliano
The effects of the nearest neighbour Coulomb repulsion, V, are considered in the one dimensional copper-oxide chain using the modified Lanczos method. Above a critical value of V w…