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

doi:10.1109/TASC.2016.2525934

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 journal › Article › peer-review

2 Scopus citations

Abstract

We have observed the voltage response of superconducting niobium strips to overcritical (I > I_c) step pulses of electrical current. The resistive response appears after a certain delay time t_d function of the temperature and of the ratio I/I_c(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 language	English
Article number	7399353
Journal	IEEE Transactions on Applied Superconductivity
Volume	26
Issue number	3
DOIs	https://doi.org/10.1109/TASC.2016.2525934
State	Published - 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.

Keywords

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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10.1109/TASC.2016.2525934

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title = "Phonon Escape Time Deduced from the Time of Nucleation of Hot Spots in Superconducting Niobium Filaments",

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.",

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AU - Oktasendra, F.

AU - Gasmi, K.

AU - Berdiyorov, G. R.

AU - Mekki, A.

AU - Maneval, J. P.

N1 - 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.

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N2 - 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.

AB - 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.

KW - Critical current density

KW - non-equilibrium superconductivity

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

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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