Spannungsstufen in denU (T)-Übergangskurven undU (I)-Kennlinien stromtragender Zinn-Whisker

Meyer, J.D.

doi:10.1007/bf00896936

Cited by 84 publications

(17 citation statements)

References 20 publications

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“…Thus, for their specimens a lowering of the temperature may have had a similar effect as a lengthening of the contact in our case, with the consequence of an increasing Io/Ic. Nevertheless, this explanation has to be applied with some caution, because the difference in the energy gaps is much smaller than in our case, where it is given by the difference of the gaps of zinc close to its critical temperature and Wood's metal far below its Too of 8.2 K. 12 For all of our samples, Io/Ic and the differential resistance do not depend on temperature. Within the SBT model this leads to a temperatureindependent quasiparticle relaxation time ~'2.…”

Section: Discussionmentioning

confidence: 99%

Dissipative state of superconducting zinc whiskers

Schulz

Tidecks

1988

J Low Temp Phys

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The current-induced breakdown of superconductivity in Zn and Zn-Ag alloy whiskers close to the critical temperature has been investigated. Above the critical current Ic the superconductor enters a dissipative state with characteristics showing a regular voltage step structure due to the appearance of phase-slip centers. For short samples there is an influence of the superconducting contacts. Unaffected phase-slip centers are only observed in long samples. For this case the temperature-independent quasiparticle relaxation time is found to be 3.2 x I0 -8 sec. For the zero-voltage intercept Io a value of 0.56 Ic is obtained.

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Section: Discussionmentioning

confidence: 99%

Dissipative state of superconducting zinc whiskers

Schulz

Tidecks

1988

J Low Temp Phys

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“…[3][4][5] and experimental (Figs. 6 and 7) results, we find the following agreements between theory and experiment: (i) the output voltage signal saturates with time when the system is in the phase-slip state, (ii) a monotonic increase of the voltage is observed when the system is in the hot-spot state, and (iii) the response time of the system decreases monotonically with temperature and applied current.…”

Section: Psc and Hs Created By A Current Pulsementioning

confidence: 97%

“…PSCs result in the formation of pronounced steps in both voltage vs temperature [3] and current-voltage characteristics [4,5] of narrow superconducting strips with transverse dimensions of the order of the superconducting coherence length ξ . For superconducting samples with lateral dimensions larger than ξ , PSCs can be generalized to phase-slip lines with almost uniform suppression of the order parameter along the sample [6].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of current-driven phase-slip centers in superconducting strips

et al. 2014

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Phase-slip centers/lines and hot spots are the main mechanisms for dissipation in current-carrying superconducting thin films. The pulsed-current method has recently been shown to be an effective tool in studying the dynamics of phase-slip centers and their evolution to hot spots. We use the time-dependent Ginzburg-Landau theory in the study of the dynamics of the superconducting condensate in superconducting strips under external current and zero external magnetic field. We show that both the flux-flow state (i.e., slow-moving vortices) and the phase-slip line state (i.e., fast-moving vortices) are dynamically stable dissipative units with temperature smaller than the critical one, whereas hot spots, which are localized normal regions where the local temperature exceeds the critical value, expand in time, resulting ultimately in a complete destruction of the condensate. The response time of the system to abrupt switching on of the overcritical current decreases with increasing both the value of the current (at all temperatures) and temperature (for a given value of the applied current). Our results are in good qualitative agreement with experiments we have conducted on Nb thin strips.

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“…Even without thermal and quantum fluctuations, the phase slip phenomena and dissipative (or resistive) states can be induced by an applied current 13,14 . Magnetic field penetrates type-II superconductors in the form of Abrikosov vortices.…”

Section: Introductionmentioning

confidence: 99%

Phase slips in superconducting weak links

2017

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Superconducting vortices and phase slips are primary mechanisms of dissipation in superconducting, superfluid, and cold atom systems. While the dynamics of vortices is fairly well described, phase slips occurring in quasi-one dimensional superconducting wires still elude understanding. The main reason is that phase slips are strongly non-linear time-dependent phenomena that cannot be cast in terms of small perturbations of the superconducting state. Here we study phase slips occurring in superconducting weak links. Thanks to partial suppression of superconductivity in weak links, we employ a weakly nonlinear approximation for dynamic phase slips. This approximation is not valid for homogeneous superconducting wires and slabs. Using the numerical solution of the timedependent Ginzburg-Landau equation and bifurcation analysis of stationary solutions, we show that the onset of phase slips occurs via an infinite period bifurcation, which is manifested in a specific voltage-current dependence. Our analytical results are in good agreement with simulations.

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Spannungsstufen in denU (T)-Übergangskurven undU (I)-Kennlinien stromtragender Zinn-Whisker

Cited by 84 publications

References 20 publications

Dissipative state of superconducting zinc whiskers

Dissipative state of superconducting zinc whiskers

Dynamics of current-driven phase-slip centers in superconducting strips

Phase slips in superconducting weak links

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