Dipolon theory of energy gap parameters at finite temperature and transition temperatures Tc and T* in high-temperature superconductors

摘要: Abstract First temperature dependent regular and pseudo-energy gap parameters pseudo-transition temperatures arising from the same physical origin have been calculated in strong coupling formalism. Temperature many-body field-theoretic techniques developed, as an extension of our previous zero-temperature formalism, to derive general expressions for renormalized energy parameter Δ ( k → , ω ) renormalization Z band χ momentum frequency making use dipolon propagator electron Green’s function taking into account explicitly dressed dipolons mediators superconductivity, screened Coulomb repulsion nonrigid bands considering retardation damping effects electron–hole asymmetry. The theory takes all necessary important correlations. Our self-consistent calculations utilize previously symmetry predicted two superconducting cuprates, one being antisymmetric (“as”) with respect exchange x y components vector other symmetric (“s”) . present solutions real imaginary parts confirm existence these (different) conclude that solution corresponds observed (“reg”) whereas pseudo -(“pse-”) gap. Explicit performed here Bi 2 Sr CaCu O 8+ δ well 8 giving corresponding transition temperatures. results are consistent available experimental data. take different appropriate sets electron–electron interaction screening constant Pauling’s TKS polarizabilities various ions systems. uncertainties values mainly due ions, constant. Migdal vertex correction has estimated. discussed experiments. In particular, show T ∗ is greater than c they origin, agreement directions further investigations pointed out.