Chapter

Spectroscopy of the superconducting energygap: quasiparticle and pair tunneling

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/9780199589494.003.0003

Series: International Series of Monographs on Physics

Spectroscopy of the superconducting energygap: quasiparticle and pair tunneling

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Tunnelling spectra in the range of energies spanning the energy gap are a primary source of information on the superconductor under study. Gap spectra of equilibrium BCS superconductors are described, and related to the theories of quasiparticle and pair tunnelling. Special cases include those of strong coupling, anisotropy of the energy gap, multiple gaps arising in two-band superconductors, and effects due to applied magnetic field and the presence of magnetic impurities. Effects on the gap spectra of pressure and of electromagnetic radiation are treated. Effects of superconducting fluctuations are described. The model of Klapwijk, Blonder, and Tinkham for the transition of a junction to a metallic contact is covered in this chapter.

Keywords: gap; BCS; quasiparticle; strong-coupling; magnetic; Klapwijk–Blonder–Tinkham; fluctuations

Chapter.  29936 words.  Illustrated.

Subjects: Condensed Matter Physics

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