Phonon structures in tunneling conductance of superconducting YBa2Cu3O7

Toshikazu Ekino, Jun Akimitsu

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We report on measurements of the tunneling conductance structures above the superconducting gap energy using YBa2Cu3O7 polycrystalline junctions. The measured second derivative data are reproducible among the junctions, and the intensities of the common structures at the biases of 37-38, 47-53, 67-77, and 94-95 mV are strong enough to be assigned. These structures are in agreement with those in the neutron phonon density of states in whole energy regions when the energies are measured from the gap edge of 26±1 meV. This correspondence indicates that the electron-phonon interaction contributes to the pairing mechanism of this superconductor.

Original languageEnglish
Pages (from-to)367-369
Number of pages3
JournalJournal of Superconductivity
Issue number2
Publication statusPublished - Apr 1994
Externally publishedYes


  • Tunneling conductance
  • YBaCuO
  • phonon structure
  • second derivative

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)


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