Optical self-energy of superconducting Pb in the terahertz region

T. Mori, E. J. Nicol, S. Shiizuka, K. Kuniyasu, T. Nojima, N. Toyota, J. P. Carbotte

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33 Citations (Scopus)


New terahertz data on the optical conductivity of Pb are presented, as well as a detailed Eliashberg analysis with particular emphasis on phonon-assisted processes not included in a BCS approach. Consideration of the optical self-energy instead of the conductivity itself helps highlight the differences with BCS predictions. Predicted coherence peaks are observed in the optical scattering rates. Impurities enhance the optical effective mass at zero frequency by an order of magnitude and induce a large peak at twice the gap in agreement with theory. This work illustrates the usefulness of the optical self-energy for the analysis of data.

Original languageEnglish
Article number174515
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number17
Publication statusPublished - 2008 May 28


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