Canonical perturbation theory and the two-band model for high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>superconductors
We analyze in more detail a model which describes spins localized on the Cu sites and carriers of oxygen character which has been proposed for high-temperature superconducting o...