caa a22 4500 467911045 CHVBK 20180406152849.0 cr unu---uuuuu 170328e20061001xx s 000 0 eng 10.1007/s11232-006-0126-1 doi (NATIONALLICENCE)springer-10.1007/s11232-006-0126-1 Peculiarities of pair interaction in the four-band Hubbard model [Elektronische Daten] [D. Digor, P. Entel, V. Moskalenko, N. Plakida] We consider the four-band model of high-temperature superconductors with copper $$3d_{x^2 - y^2 } $$ and 4s electrons and oxygen 2p x and 2p y electrons. We assume that the Coulomb repulsion between the copper 3d electrons is strong. We diagonalize the oxygen subsystem and pass to the Wannier representation for the CuO 2 cluster. We study the properties of a local cell model and find its low-energy states such as the one-particle doublet and the two-particle singlet and triplet states. We consider the cell fermion delocalization because of their tunneling between the copper sites. We obtain a system of Dyson-type equations for renormalized one-particle Green's functions and discuss whether it can be simplified. Springer Science+Business Media, Inc., 2006 strongly correlated electron system nationallicence high-temperature superconductor nationallicence Digor D. Institute for Applied Physics, Academy of Sciences of Moldova, Chisinau, Moldova aut Entel P. Institut für Fyzik, Universität Duisburg-Essen, Duisburg, Germany aut Moskalenko V. Institute for Applied Physics, Academy of Sciences of Moldova, Chisinau, Moldova aut Plakida N. Joint Institute for Nuclear Research, Dubna, Moscow Oblast, Russia aut Theoretical and Mathematical Physics Kluwer Academic Publishers-Consultants Bureau 149/1(2006-10-01), 1382-1392 0040-5779 149:1<1382 2006 149 11232 https://doi.org/10.1007/s11232-006-0126-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11232-006-0126-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Digor D. Institute for Applied Physics, Academy of Sciences of Moldova, Chisinau, Moldova aut NATIONALLICENCE 700 1- Entel P. Institut für Fyzik, Universität Duisburg-Essen, Duisburg, Germany aut NATIONALLICENCE 700 1- Moskalenko V. Institute for Applied Physics, Academy of Sciences of Moldova, Chisinau, Moldova aut NATIONALLICENCE 700 1- Plakida N. Joint Institute for Nuclear Research, Dubna, Moscow Oblast, Russia aut NATIONALLICENCE 773 0- Theoretical and Mathematical Physics Kluwer Academic Publishers-Consultants Bureau 149/1(2006-10-01), 1382-1392 0040-5779 149:1<1382 2006 149 11232 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer