Speed limit to the Abrikosov lattice in mesoscopic superconductors

Grimaldi, Gaia; Leo, Antonio; Sabatino, P.; Carapella, G.; Nigro, A.; Pace, S.; Moshchalkov, Victor; Silhanek, Alejandro

doi:10.1103/physrevb.92.024513

Cited by 54 publications

(68 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although we are used to correlate flux pinning with critical current, and flux motion with dissipation, by gradually increasing the bias current above I c the vortex motion can reach a speed limit which is unavoidably affected by pinning mechanism itself 35 . Either due to material defects 4,36 , or to geometrical barrier 37,38 , pinning becomes crucial in flux flow motion at high velocities too. Can the intrinsic layered structure of this Fe(Se,Te) superconductor make feel its influence?…”

Section: Discussionmentioning

confidence: 99%

Angular dependence of vortex instability in a layered superconductor: the case study of Fe(Se,Te) material

Grimaldi

Leo

Nigro

et al. 2018

Sci Rep

View full text Add to dashboard Cite

Anisotropy effects on flux pinning and flux flow are strongly effective in cuprate as well as iron-based superconductors due to their intrinsically layered crystallographic structure. However Fe(Se,Te) thin films grown on CaF2 substrate result less anisotropic with respect to all the other iron based superconductors. We present the first study on the angular dependence of the flux flow instability, which occurs in the flux flow regime as a current driven transition to the normal state at the instability point (I*, V*) in the current-voltage characteristics. The voltage jumps are systematically investigated as a function of the temperature, the external magnetic field, and the angle between the field and the Fe(Se,Te) film. The scaling procedure based on the anisotropic Ginzburg-Landau approach is successfully applied to the observed angular dependence of the critical voltage V*. Anyway, we find out that Fe(Se,Te) represents the case study of a layered material characterized by a weak anisotropy of its static superconducting properties, but with an increased anisotropy in its vortex dynamics due to the predominant perpendicular component of the external applied magnetic field. Indeed, I* shows less sensitivity to angle variations, thus being promising for high field applications.

show abstract

Section: Discussionmentioning

confidence: 99%

Angular dependence of vortex instability in a layered superconductor: the case study of Fe(Se,Te) material

Grimaldi

Leo

Nigro

et al. 2018

Sci Rep

View full text Add to dashboard Cite

show abstract

“…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: 86%

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

et al. 2015

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…First, a higher stability in the current conduction at higher temperature, due to a weaker contribution from the extrinsic thermal mechanism to the FFI [9]. Second, the weaker influence of the pinning strength on the quenching current with respect to the influence on the critical current, regardless of the pinning mechanism [18]- [20].…”

Section: B Quenching Current Vs Critical Currentmentioning

confidence: 99%

Quenching Current by Flux-Flow Instability in Iron-Chalcogenides Thin Films

Leo¹,

Grimaldi²,

Guarino³

et al. 2017

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

The stability against quench is one of the main issues to be pursued in a superconducting material, which should be able to perform at very high levels of current densities. Here we focus on the connection between the critical current Ic and the quenching current I â\u88\u97 associated to the so-called Flux-Flow Instability phenomenon, which sets-in as an abrupt transition from the flux flow state to the normal state. To this purpose, we analyze several current-voltage characteristics of three types of Iron-Based thin films, acquired at different temperature and applied magnetic field values. For these samples, we discuss the impact of a possible coexistence of intrinsic electronic mechanisms and extrinsic thermal effects on the quenching current dependence upon the applied magnetic field. The differences between the quenching current and the critical current are also reported in the case of predominant intrinsic mechanisms. Carrying out a comparison with the HTS case, we suggest, which material can be the best tradeoff between maximum operating temperature, higher upper critical field, and stability under high current bias

show abstract

Speed limit to the Abrikosov lattice in mesoscopic superconductors

Cited by 54 publications

References 39 publications

Angular dependence of vortex instability in a layered superconductor: the case study of Fe(Se,Te) material

Angular dependence of vortex instability in a layered superconductor: the case study of Fe(Se,Te) material

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

Quenching Current by Flux-Flow Instability in Iron-Chalcogenides Thin Films

Contact Info

Product

Resources

About