Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-07-21
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, submitted to Proceedings SNS20004, Spain, 11-16.07.2004, J. Phys. Chem. Solids
Scientific paper
A microscopic theory of superconductivity is formulated within an effective $p$-$d$ Hubbard model for a CuO2 plane. By applying the Mori-type projection technique, the Dyson equation is derived for the Green functions in terms of Hubbard operators. The antiferromagnetic exchange caused by interband hopping results in pairing of all carries in the conduction subband and high Tc proportional to the Fermi energy. Kinematic interaction in intraband hopping is responsible for the conventional spin-fluctuation pairing. Numerical solution of the gap equation proves the d-wave gap symmetry and defines Tc doping dependence. Oxygen isotope shift and pressure dependence of Tc are also discussed.
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