Nonlinearity in the flux-flow behavior of thin-film superconductors

Klein, Wolfgang; Huebener, R. P.; Gauss, S.; Parisi, J.

doi:10.1007/bf00683694

Cited by 134 publications

(117 citation statements)

References 20 publications

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“…When the bias current is further increased, the linear flux-flow regime is present until a certain value I * , where a sudden jump of the voltage V * takes place in agreement with the Larkin-Ovchinnikov theory [9]. Such instabilities were previously observed in a number of different superconducting systems [1,6,7,[23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. V * is related to the so-called critical velocity v * by the relation [9] At high fields the jump is replaced by a more continuous transition towards the normal state, as is clearly seen looking at the curves corresponding to the fields of 0.4 and 0.5 T in the inset of Fig.…”

Section: Resultssupporting

confidence: 71%

Influence of the magnetic configuration on the vortex-lattice instability in Nb/permalloy bilayers

et al. 2017

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We studied the dynamic instability of the vortex lattice in Nb/permalloy (permalloy = Ni 0.8 Fe 0.2 ) bilayers with different Py thickness d Py . When d Py is larger than some critical value, d ESD cr , which in our samples has been evaluated to be 125 nm, an inhomogeneous magnetic configuration is induced in the samples as a precursor to a fully developed stripe domain state. We found that this inhomogeneous magnetic configuration of the Py layer promotes larger values of the critical velocity for the vortex lattice instability, v * , with respect to the homogeneous case.

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Section: Resultssupporting

confidence: 71%

Influence of the magnetic configuration on the vortex-lattice instability in Nb/permalloy bilayers

et al. 2017

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“…This prediction has been indeed observed in many different superconducting materials, [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] thus demonstrating the universal character of this phenomenon. According to the LO model, the current density J * and the voltage V * at the point where the instability is triggered, are uniquely defined.…”

Section: Introductionsupporting

confidence: 53%

Onset, evolution, and magnetic braking of vortex lattice instabilities in nanostructured superconducting films

et al. 2015

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In 1976 Larkin and Ovchinnikov [Sov. Phys. JETP 41, 960 (1976)] predicted that vortex matter in superconductors driven by an electrical current can undergo an abrupt dynamic transition from a flux-flow regime to a more dissipative state at sufficiently high vortex velocities. Typically this transition manifests itself as a large voltage jump at a particular current density, so-called instability current density J * , which is smaller than the depairing current. By tuning the effective pinning strength in Al films, using an artificial periodic pinning array of triangular holes, we show that a unique and well defined instability current density exists if the pinning is strong, whereas a series of multiple voltage transitions appear in the relatively weaker pinning regime. This behavior is consistent with time-dependent Ginzburg-Landau simulations, where the multiple-step transition can be unambiguously attributed to the progressive development of vortex chains and subsequently phase-slip lines. In addition, we explore experimentally the magnetic braking effects, caused by a thick Cu layer deposited on top of the superconductor, on the instabilities and the vortex ratchet effect.

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“…Thus overall η declines despite the shrinking in size with increasing E. Like the hot-electron case discussed earlier, this again leads to a non-monotonic j(E) curve and a vortex instability. The LO instability has been observed in previous experiments [14][15][16][17][18][19][20][21][22][23][24] and the combination of heating effects and the LO mechanism have been considered by various authors [25][26][27][28][29] .…”

Section: Introduction and Theorymentioning

confidence: 91%

Vortex instability in molybdenum-germanium superconducting films

Liang

Kunchur²

2010

Phys. Rev. B

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We studied the high driving force regime of the current-voltage transport response in the mixed state of amorphous molybdenum-germanium superconducting films to the point where the flux flow becomes unstable. The observed nonlinear response conforms with the classic Larkin-Ovchinikov picture with a quasiparticle-energy-relaxation rate dominated by the quasiparticle recombination process. The measured energy relaxation rate was found to have a magnitude and temperature dependence in agreement with theory.

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Nonlinearity in the flux-flow behavior of thin-film superconductors

Cited by 134 publications

References 20 publications

Influence of the magnetic configuration on the vortex-lattice instability in Nb/permalloy bilayers

Influence of the magnetic configuration on the vortex-lattice instability in Nb/permalloy bilayers

Onset, evolution, and magnetic braking of vortex lattice instabilities in nanostructured superconducting films

Vortex instability in molybdenum-germanium superconducting films

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