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Tunneling Spectroscopy of Conventional and Unconventional Superconductors

  • J. Zasadzinski

Abstract

Tunneling spectroscopy of conventional superconductors [1] such as Pb [2] leads to a complete description of the superconducting state. From the tunneling conductance \(\frac{{dI}}{{dV}}\) vs. V (appropriately normalized), one can obtain the quasiparticle density of states, N(E). This gives an implicit measure of the complex, superconducting gap parameter, Δ(E). Using Migdal-Eliashberg theory [3] the gap parameter can be “inverted” by the iterative McMillan- Rowell procedure (MR) [2] to obtain the microscopic interactions responsible for superconductivity, namely, the electron-phonon spectral function, α2 F(ω), and the renormalized coulomb pseudopotential, μ*. These quantities can then be used to determine the transition temperature, T c, as well as the electron mass enhancement, 1+λ, which enters normal state thermodynamic properties such as the specific heat [4]. In some cases the α2 F(ω), obtained from tunneling has been used to provide a very good fit of the temperature dependent electrical resistivity far above T c [5]. The fact that both superconducting and normal state quantities can be determined demonstrates both the accuracy of strong-coupling superconductivity theory and the power of the tunneling method. The various manifestations of the electron-phonon interaction can be found in the review articles of Carbotte [3] and Allen [4].

Keywords

Tunnel Junction Andreev Reflection Tunneling Spectroscopy Tunneling Conductance Tunneling Spectrum 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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© Springer-Verlag Berlin Heidelberg 2003

Authors and Affiliations

  • J. Zasadzinski
    • 1
  1. 1.Physics DeptIllinois Institute of TechnologyChicagoUSA

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