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Thermodynamic Green functions in theory of superconductivity
2006
Condensed Matter Physics
A general theory of superconductivity is formulated within the thermodynamic Green function method for various types of pairing mediated by phonons, spin fluctuations, and strong Coulomb correlations in the Hubbard and t-J models. A rigorous Dyson equation for matrix Green functions is derived in terms of a self-energy as a many-particle Green function. By applying the noncrossing approximation for the self-energy, a closed selfconsistent system of equations is obtained, similar to the
doi:10.5488/cmp.9.3.619
fatcat:jpjvmwysnfeivazs2fuq2waq2q