JETP Letters

, Volume 96, Issue 11, pp 743–749

Terahertz phonon spectroscopy of doped superconducting cuprates

  • Ya. G. Ponomarev
  • H. H. Van
  • S. A. Kuzmichev
  • S. V. Kulbachinskii
  • M. G. Mikheev
  • M. V. Sudakova
  • S. N. Tchesnokov
Article

DOI: 10.1134/S0021364012230129

Cite this article as:
Ponomarev, Y.G., Van, H.H., Kuzmichev, S.A. et al. Jetp Lett. (2013) 96: 743. doi:10.1134/S0021364012230129

Abstract

Facts are presented evidencing a strong electron-phonon interaction in doped BSCCO superconductors. A pronounced fine structure in dI/dV characteristics of Josephson junctions has been observed which is caused by interaction of AC Josephson current with Raman-active optical phonon modes. “Quantization” of the “gap” voltage for natural nanosteps on the cryogenically cleaved surfaces of BSCCO proves the existence of the intrinsic Josephson effect. A sharp extra structure in the current-voltage characteristics of nanosteps is attributed to the presence of the extended van Hove singularity.

Copyright information

© Pleiades Publishing, Ltd. 2012

Authors and Affiliations

  • Ya. G. Ponomarev
    • 1
  • H. H. Van
    • 1
  • S. A. Kuzmichev
    • 1
  • S. V. Kulbachinskii
    • 1
  • M. G. Mikheev
    • 1
  • M. V. Sudakova
    • 1
  • S. N. Tchesnokov
    • 1
  1. 1.Department of Low Temperature PhysicsMoscow State UniversityMoscowRussia