Resistive states created in superconducting NbTiN filaments by an electrical current pulse
Author(s) -
K. Harrabi
Publication year - 2015
Publication title -
aip advances
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 58
ISSN - 2158-3226
DOI - 10.1063/1.4914103
Subject(s) - superconductivity , condensed matter physics , resistive touchscreen , voltage , current (fluid) , physics , time constant , pulse (music) , strips , materials science , electrical engineering , thermodynamics , composite material , quantum mechanics , engineering
We have observed as a function of the time the appearance of the voltage caused by a larger-than-critical (I > Ic) step-pulse of current in narrow NbTiN strips at 4.2 K. Different current intensities produced either phase-slip centres characterized by a voltage saturating with the time, or ever expanding hot spots. These dissipative structures occur after a measurable delay time, whose dependence upon the ratio I/Ic can be analysed through a Ginzburg-Landau theory to yield a unique adjustable time constant
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