Continuous change from weak to strong coupling behavior in quasi-one-dimensional superconductors

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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“…3. We remark that for a superconductor with an anisotropic gap such as zinc, charge imbalance relaxation via elastic scattering may be important.…”

Section: Discussionmentioning

confidence: 99%

Dissipative state of superconducting zinc whiskers

Schulz

Tidecks

1988

J Low Temp Phys

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“…Andronov et al [1], in their pioneering work, justify this approximation by arguing that it is valid for superconductors with sufficient high conductivity in the normal state. Besides that, references [31][32][33] describe the quasiparticles' influence on the scalar potential. In addition, a relationship between γ (or τ E ) and the characteristic relaxation time of the quasiparticles (τ qp ) can be accessed.…”

Section: Theoretical Modelmentioning

confidence: 99%

Dynamical regimes of kinematic vortices in the resistive state of a mesoscopic superconducting bridge

Presotto

Sardella

Malvezzi

et al. 2020

J. Phys.: Condens. Matter

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In this work, we studied the dynamics of the kinematic vortices (kV) in a mesoscopic superconductor under the influence of external applied magnetic fields (H) and transport currents (J tr ). A J tr (H ) phase diagram is determined. We show that the vortex dynamics are profoundly affected by the presence of constrictions and by H. We find that between the Meissner and normal states, the resistive state is comprehended by three distinct states. One of these states is a kinematic vortex-antivortex pair for low values of H. For moderate values of fields, the kV state is unpaired and only a single kinematic vortex exists. In the high field regime, the kinematic vortex becomes an Abrikosov-like state with a lower velocity. It was also shown that for tenths of picoseconds, a surface barrier effect acts over the instantaneous velocity of the kV.

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Pb based alloys and compounds

Yu¹,

Kaner²

O (Without Cuprates) - Sc

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Continuous change from weak to strong coupling behavior in quasi-one-dimensional superconductors

Cited by 16 publications

References 38 publications

Dissipative state of superconducting zinc whiskers

Dissipative state of superconducting zinc whiskers

Dynamical regimes of kinematic vortices in the resistive state of a mesoscopic superconducting bridge

Pb based alloys and compounds

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