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

QEERI - Energy Center

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

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
Publication status	Published - 15 Apr 2016

Keywords

Critical current density
non-equilibrium superconductivity
superconducting thin film

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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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T1 - Phonon Escape Time Deduced from the Time of Nucleation of Hot Spots in Superconducting Niobium Filaments

AU - Harrabi, K.

AU - Oktasendra, F.

AU - Gasmi, K.

AU - Berdiyorov, G. R.

AU - Mekki, A.

AU - Maneval, J. P.

PY - 2016/4/15

Y1 - 2016/4/15

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

KW - superconducting thin film

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DO - 10.1109/TASC.2016.2525934

M3 - Article

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JO - IEEE Transactions on Applied Superconductivity

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ER -

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

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