Chapter

Superconducting phonon spectra and α<sup>2</sup>F(ω)

E. L. Wolf

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/9780199589494.003.0006

Series: International Series of Monographs on Physics

Superconducting phonon spectra and α2F(ω)

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This chapter presents a survey of superconducting tunneling Eliashberg functions α2 F(ω). The s-p elemental superconductors and their alloys are reported, followed by amorphous metals. The class of transition metal superconductors, alloys, and compounds is addressed, with attention to Nb, NbZr, and Nb3Sn. The normally non-superconducting metal Mg is studied when induced into strong coupling superconductivity by proximity to Nb, using the Proximity Electron Tunneling Spectroscopy (PETS) method. The superconductivity induced by a resonance mode is treated in the case of MoRe alloys. Eliashberg inversion of data from bismuthate and cuprate superconductors is described. Paramagnon effects in depressing superconductivity are estimated. The pulsed laser method of determining electron phonon coupling in metals carried out by Brorson et al. is found to be in close agreement with tunnelling results.

Keywords: α2 F(ω); Eliashberg; spectra proximity; alloy; compound; Arnold

Chapter.  14400 words.  Illustrated.

Subjects: Condensed Matter Physics

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