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- W2156297709 abstract "It is shown that the antisymmetrized geminal power wavefunction (AGP) in the macroscopic limit and the Bardeen-Cooper-Schrieffer (BCS) supercon-ductivity model with fixed mean number of electrons coincide to arbitrary order in deviations from the extreme-type function which is considered as the carrier of the superconductivity property. Variational equations for the AGP in the macroscopic limit are formulated in terms of two sets of parameters, ∈ i and Δi , which under simplifying assumptions reduce to eigenvalues of the open-shell Roothaan one-electron Hamiltonian and to the BCS energy gap parameter, respectively. The superconducting state is shown to be stable for the solution of these equations with a macroscopic number of non-zero Δi and of degenerate ∈ i =∈F at the Fermi level ∈F. The macroscopic contribution to the maximal pair occupation number which is responsible for the superconductivity is expressed as a mean value of Δi 2/[(∈ i −∈F)2+Δi 2]. The formulated non-zero temperature version of the equations for ∈ i , Δi is able to describe the superconducting phase transition. On this ground the necessary condition of stabilization of the superconducting state is formulated that is the existence of the macroscopic-fold near-degenerate and almost half-filled level. As is shown it is realized in the energy band structure of doped fullerides, copper oxide ceramics and perovskite-type crystals, e.g. BaBiO3. The additional requirement of negativity of exchange interelectron-interaction integrals may be satisfied not only by the known vibronic mechanism but also, as is demonstrated, by the polarization potential of an environment in a plane layer of stratum structures." @default.
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- W2156297709 date "1994-08-20" @default.
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- W2156297709 title "Molecular viewpoint on high-temperature superconductivity Importance of orbital degeneracy" @default.
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- W2156297709 doi "https://doi.org/10.1080/00268979400100774" @default.
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