Chapter

Conventional tunneling spectroscopy of strong-coupling superconductors

Jonathan L Kvanvig

in Principles of Electron Tunneling Spectroscopy

Second edition

Published in print November 2011 | ISBN: 9780199589494
Published online January 2012 | e-ISBN: 9780191731334 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780199589494.003.0004

Series: International Series of Monographs on Physics

Conventional tunneling spectroscopy of strong-coupling superconductors

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This chapter describes the inversion of tunnelling data over the broader range of energy to deduce the effective phonon spectrum causing the electron pairing. The resulting coupling parameter lambda is related to the superconducting transition temperature of the sample. The inversion is based on the Eliashberg strong-coupling theory of superconductivity applied to dI/dV tunnelling density of states spectra up to the Debye energy characterizing the phonon spectrum of the superconductor. The variational method of McMillan and Rowell is the primary analytical tool in this work. Extensions of the method to include variations in the electronic density of states, anisotropy, and spin fluctuations are described here. The direct inversion method of Galkin, D'yachenko, and Svistunov is also described.

Keywords: phonon; Eliashberg; McMillan–Rowell; Lambda; inversion; spectra; α2 F(ω)

Chapter.  7139 words.  Illustrated.

Subjects: Condensed Matter Physics

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