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Spectral shape dependence in the very strong coupling regime of Eliashberg theory

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Abstract

The effect of α2 F(ω) shape dependence on several physical properties of superconductors is studied at various values of the strong coupling indexT c ln . Our results indicate that the degree of shape dependence of each property is sensitive to the value ofT c ln . Generally, for the region we examine, 0.25≤T c ln ≤1.3, the dependence on shape is found to be higher than in the conventional strong coupling regimeT c ln ≲0.2. However, with the exception of the mass enhancement parameter λ, the amount of shape dependence does not increase steadily withT c ln and there appears to be regions of maximum shape sensitivity.

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Akis, R., Carbotte, J.P. Spectral shape dependence in the very strong coupling regime of Eliashberg theory. J Low Temp Phys 76, 65–74 (1989). https://doi.org/10.1007/BF00682267

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Keywords

  • Magnetic Material
  • Strong Coupling
  • Spectral Shape
  • Strong Coupling Regime
  • Shape Sensitivity