Phonon Escape Time Deduced from the Time of Nucleation of Hot Spots in Superconducting Niobium Filaments

K. Harrabi, F. Oktasendra, K. Gasmi, G. R. Berdiyorov, A. Mekki, J. P. Maneval

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We have observed the voltage response of superconducting niobium strips to overcritical (I > Ic) step pulses of electrical current. The resistive response appears after a certain delay time td function of the temperature and of the ratio I/Ic(T), which can be analyzed through a time-dependent Ginzburg-Landau equation, along the method introduced by Tinkham. The experimental data can be fitted by using an effective gap relaxation time of a few nanoseconds, independently of the sample widths and of the temperature. Assuming proportionality to sample thickness, this indicates a phonon escape time of about 8 ps per nanometer of thickness for a Nb film dc sputtered on polished crystalline Al2O3.

Original languageEnglish
Article number7399353
JournalIEEE Transactions on Applied Superconductivity
Issue number3
StatePublished - 15 Apr 2016

Bibliographical note

Funding Information:
The work of K. Harrabi, F. Oktasendra, K. Gasmi, and A. Mekki was supported by King Fahd University of Petroleum and Minerals, Saudi Arabia, under the IN131034 DSR Project.

Publisher Copyright:
© 2016 IEEE.


  • Critical current density
  • non-equilibrium superconductivity
  • superconducting thin film

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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