We present the model of superconducting ceramics using the single band extended Hubbard Hamiltonian. We investigate the simultaneous presence of antiferromagnetism (AF) and d-wave superconductivity (SC) in the coherent potential (CP) approximation applied to the on-site Coulomb repulsion U. We consider the hopping interaction, Δt, the inter-site charge-charge interaction, V, (creating SC), and the single site Hund's type exchange interaction, Fin, (creating AF). The influence of these interactions on the separation of superconducting and antiferromagnetic phases near the half-filling point is investigated. Results are compared with the experimental data for YBaCuO and NdCeCuO compounds.
@article{arxiv.1406.2090,
title = {Phase separation near half-filling point in superconducting compounds},
author = {K. Kucab and G. Górski and J. Mizia},
journal= {arXiv preprint arXiv:1406.2090},
year = {2023}
}