Electric-Field-Induced Electronic Instability in Amorphous<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Mo</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Si Superconducting Films

Самойлов, А. В.; Kończykowski, M.; Yeh, N.-C.; Berry, S.; Tsuei, C. C.

doi:10.1103/physrevlett.75.4118

Cited by 59 publications

(49 citation statements)

References 7 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: 54%

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: 54%

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

et al. 2017

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“…The core size is typically much smaller than L θ , so the dynamic equation for the core temperature θ m (t) can be obtained from the self-consistency condition θ m (t) = θ(u(t), 0, t), resulting in Eq. (25). Next we consider the steady-state temperature distribution T (x, y) averaged over high-frequency vortex oscillations, at 2πωt θ >> 1.…”

Section: Discussionmentioning

confidence: 99%

“…Then q(t) = q 0 + W δ(t) and Eq. (25) results in the following implicit equation for δT m (t) at t > δt:…”

Section: A Instabilities Of Viscous Flux Flowmentioning

confidence: 99%

Dynamics of vortex penetration, jumpwise instabilities, and nonlinear surface resistance of type-II superconductors in strong rf fields

2008

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We consider nonlinear dynamics of a single vortex in a superconductor in a strong rf magnetic field B0 sin ωt. Using the London theory, we calculate the dissipated power Q(B0, ω), and the transient time scales of vortex motion for the linear Bardeen-Stephen viscous drag force, which results in unphysically high vortex velocities during vortex penetration through the oscillating surface barrier. It is shown that penetration of a single vortex through the ac surface barrier always involves penetration of an antivortex and the subsequent annihilation of the vortex antivortex pairs. Using the nonlinear Larkin-Ovchinnikov (LO) viscous drag force at higher vortex velocities v(t) results in a jump-wise vortex penetration through the surface barrier and a significant increase of the dissipated power. We calculate the effect of dissipation on nonlinear vortex viscosity η(v) and the rf vortex dynamics and show that it can also result in the LO-type behavior, instabilities, and thermal localization of penetrating vortex channels. We propose a thermal feedback model of η(v), which not only results in the LO dependence of η(v) for a steady-state motion, but also takes into account retardation of temperature field around rapidly accelerating vortex, and a long-range interaction with the surface. We also address the effect of pinning on the nonlinear rf vortex dynamics and the effect of trapped magnetic flux on the surface resistance Rs calculated as a function or rf frequency and field. It is shown that trapped flux can result in a temperature-independent residual resistance Ri at low T , and a hysteretic low-field dependence of Ri(B0), which can decrease as B0 is increased, reaching a minimum at B0 much smaller than the thermodynamic critical field Bc. We propose that cycling of rf field can reduce Ri due to rf annealing of magnetic flux which is pumped out by rf field from the thin surface layer of the order of the London penetration depth.

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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: Introductionmentioning

confidence: 87%

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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Electric-Field-Induced Electronic Instability in AmorphousMo3Si Superconducting Films

Cited by 59 publications

References 7 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

Dynamics of vortex penetration, jumpwise instabilities, and nonlinear surface resistance of type-II superconductors in strong rf fields

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

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