Singularity of two-electron density of states and anomalous T-dependence of SC gap of high-Tc superconducting crystals

It is shown theoretically that complicated structure of electron bands cros sing the Fermi level and presence of features (singularities) in two-electr on density of states can give rise to arising deeply inside of band far fro m E-F new coupled states which may also be characterized by SC gap and whic h are responsible for SC of crystals too. The temperature dependence of bot h SC gaps as traditional (located near E-F) and "new' ones are strongly cha nged when wave vector of electron pairs increases.