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

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

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

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
Volume26
Issue number3
DOIs
Publication statusPublished - 15 Apr 2016

Fingerprint

Niobium
niobium
escape
filaments
Nucleation
nucleation
time functions
Landau-Ginzburg equations
Relaxation time
strip
Time delay
relaxation time
Crystalline materials
Temperature
temperature
Electric potential
electric potential
pulses

Keywords

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

ASJC Scopus subject areas

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

Cite this

Phonon Escape Time Deduced from the Time of Nucleation of Hot Spots in Superconducting Niobium Filaments. / Harrabi, K.; Oktasendra, F.; Gasmi, K.; Berdiyorov, Golibjon; Mekki, A.; Maneval, J. P.

In: IEEE Transactions on Applied Superconductivity, Vol. 26, No. 3, 7399353, 15.04.2016.

Research output: Contribution to journalArticle

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