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Resistive states created in superconducting NbTiN filaments by an electrical current pulse
1.G. N. Gol’tsman, O. Okunev, G. Chulkova, A. Lipatov, A. Semenov, K. Smirnov, B. Voronov, A. Dzardanov, C. Williams, and Roman Sobolewski, App. Phys. Lett. 79, 705 (2001).
3.M. Tinkham, Intro. to Superconductivity, 2nd ed. (McGraw-Hill, Singapore, 1996), Chap. 11.
4.M. Tinkham, inNon-Equilibrium Superconductivity, Phonons and Kapitza Boundaries, edited by K.E. Gray (Plenum, New York, 1981), pp. 231-262.
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We have observed as a function of the time the appearance of the voltage caused by a larger-than-critical (I > I
) 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/I
can be analysed through a Ginzburg-Landau theory to yield a unique adjustable time constant.
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