Pinning effects on self-heating and flux-flow instability in superconducting films near 
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Shklovskij, Valerij A.; Nazipova, Anastasiia P.; Dobrovolskiy, Oleksandr V.

doi:10.1103/physrevb.95.184517

Cited by 25 publications

(22 citation statements)

References 67 publications

(183 reference statements)

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“…This is because of the depinning current decreasing with increasing temperature and the flux flow setting on at smaller dc densities j d < j < j * thus allowing one to operate in an extended current range where overheating effects are negligible. Here j * is the current density corresponding to an abrupt transition of the sample into the normal state due to the Larkin-Ovchinnikov instability [16,18,19,[43][44][45][46][47][48].…”

Section: A "Ratchet Window" In Microwave Power Absorptionmentioning

confidence: 99%

Mobile fluxons as coherent probes of periodic pinning in superconductors

Dobrovolskiy

Huth

Shklovskij

et al. 2017

Sci Rep

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The interaction of (quasi)particles with a periodic potential arises in various domains of science and engineering, such as solid-state physics, chemical physics, and communication theory. An attractive test ground to investigate this interaction is represented by superconductors with artificial pinning sites, where magnetic flux quanta (Abrikosov vortices) interact with the pinning potential U(r) = U(r + R) induced by a nanostructure. At a combination of microwave and dc currents, fluxons act as mobile probes of U(r): The ac component shakes the fluxons in the vicinity of their equilibrium points which are unequivocally determined by the local pinning force counterbalanced by the Lorentz force induced by the dc current, linked to the curvature of U(r) which can then be used for a successful fitting of the voltage responses. A good correlation of the deduced dependences U(r) with the cross sections of the nanostructures points to that pinning is primarily caused by vortex length reduction. Our findings pave a new route to a non-destructive evaluation of periodic pinning in superconductor thin films. The approach should also apply to a broad class of systems whose evolution in time can be described by the coherent motion of (quasi)particles in a periodic potential.

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Section: A "Ratchet Window" In Microwave Power Absorptionmentioning

confidence: 99%

Mobile fluxons as coherent probes of periodic pinning in superconductors

Dobrovolskiy

Huth

Shklovskij

et al. 2017

Sci Rep

Self Cite

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“…Namely, while the radiated power from a 1 mm 2 sample surface has been estimated to be of the order of ~10 −7 W for a triangular vortex lattice, this value drastically decreases in the presence of disorder 28 . While the vortex flow is known to become unstable at vortex velocities of the order of 1 km s −1 29 , 30 , for an em generation at f 0 ≃ 10 GHz, i.e., in the frequency range which is important for microwave applications, modulation of the em properties of the superconductor at a length scale of and below 100 nm is required. Unfortunately, a thin film geometry with an out-of-plane magnetic field makes an em generation detection barely feasible, as the area of the side surfaces crossed by vortices becomes negligibly small.…”

Section: Introductionmentioning

confidence: 99%

Microwave emission from superconducting vortices in Mo/Si superlattices

Dobrovolskiy¹,

Bevz²,

Mikhaı̆lov³

et al. 2018

Nat Commun

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Most of superconductors in a magnetic field are penetrated by a lattice of quantized flux vortices. In the presence of a transport current causing the vortices to cross sample edges, emission of electromagnetic waves is expected due to the continuity of tangential components of the fields at the surface. Yet, such a radiation has not been observed so far due to low radiated power levels and lacking coherence in the vortex motion. Here, we clearly evidence the emission of electromagnetic waves from vortices crossing the layers of a superconductor/insulator Mo/Si superlattice. The emission spectra consist of narrow harmonically related peaks which can be finely tuned in the GHz range by the dc bias current and, coarsely, by the in-plane magnetic field value. Our findings show that superconductor/insulator superlattices can act as dc-tunable microwave generators bridging the frequency gap between conventional radiofrequency oscillators and (sub-)terahertz generators relying upon the Josephson effect.

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“…Within all these models, however, the presence of pinning, a key parameter especially when dealing with HTS, was missing. Several experimental and theoretical works addressing this point found unconventional non-monotonic behaviors of v* ( H ) [ 19 , 20 , 21 ]. In this work, we analyze the flux-flow instabilities of the vortex lattice in high-temperature superconducting YBa 2 Cu 3 O 7-x (YBCO) nanowires with variable widths, offering a tantalizing potential for detector applications.…”

Section: Introductionmentioning

confidence: 99%

Vortex Lattice Instabilities in YBa2Cu3O7-x Nanowires

et al. 2018

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High-resolution focused ion beam lithography has been used to fabricate YBa2Cu3O7-x (YBCO) wires with nanometric lateral dimensions. In the present work, we investigate Flux-flow instabilities in nanowires of different widths, showing sudden voltage switching jumps from the superconducting to the normal state. We present an extensive study on the temperature and field dependence of the switching characteristics which reveal that voltage jumps become less abrupt as the temperature increases, and disappear at the vortex-liquid state. On the contrary, the current distribution at the critical point becomes narrower at high temperatures. Sharp voltage switchings very close to the critical current density can be obtained by reducing the width of the nanowires, making them very appealing for practical applications.

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Pinning effects on self-heating and flux-flow instability in superconducting films near Tc

Cited by 25 publications

References 67 publications

Mobile fluxons as coherent probes of periodic pinning in superconductors

Mobile fluxons as coherent probes of periodic pinning in superconductors

Microwave emission from superconducting vortices in Mo/Si superlattices

Vortex Lattice Instabilities in YBa2Cu3O7-x Nanowires

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