Possibility of superconducting type correlations in repulsive Fermi systems

The possibility of the existence of superconducting correlations is analyzed by using the Hubbard model with repulsion on the basis of the generalized self-consistent field method (without resorting to the auxiliary field formalism or equivalent approximations based on the “spherical” type uncontrollable approximations). It is shown that a superconducting solution does not exist in this method under the condition forbidding a double occupancy of a lattice site. The results are compared with the recent data.

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