Abstract
A group-theoretical approach is developed to constructing two-electron states in the basis of one-electron states of crystals. Such states correspond to Cooper pairs in superconductors and pseudogap states (at T* > Tc). The theory is applied to unconventional superconductors: heavy-fermion and high-Tc materials. Comparison of theoretical results with experimental data is used to gain insight into the structure of two-electron states in these materials.
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