Phase Separation near Half-Filling Point in Superconducting Compounds
K. Kucab, G. Górski and J. Mizia
Faculty of Mathematics and Natural Sciences, University of Rzeszów, T. Rejtana 16A, 35-959 Rzeszów, Poland
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We present the model of superconducting ceramics using the single band extended Hubbard Hamiltonian. We investigate the simultaneous presence of antiferromagnetism and d-wave superconductivity in the coherent potential approximation applied to the on-site Coulomb repulsion U. We consider the hopping interaction, Δt, the inter-site charge-charge interaction, V (creating superconductivity), and the single site Hund type exchange interaction, Fin (creating antiferromagnetism). 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.

DOI: 10.12693/APhysPolA.126.A-104
PACS numbers: 71.10.Fd, 74.20.-z, 75.10.Lp