This behaviour can be explained by the fact that antivortices (vortices) are created at the white (red) border of the Py layer as illustrated in Fig. 3(b,c). Indeed, incoming vortices first annihilate with antivortices before moving further into the area covered by the magnetic layer (...
Understanding the physics of vortices in these complex materials and controlling of the atomic structure of defects have made it possible to design their performance and achieve exceptional values of superconducting properties which enable their integration into devices. In order to improve performance and...
Moreover, due to increased critical currents at low T, the flux entry into the samples is strongly delayed and may depend on the dynamics of phase slips or entry of Abrikosov vortices which can transfer single or multiple flux quanta into the voids inside the superconductor. In this work we...
et al. Coherence factors in a high-Tc cuprate probed by Quasi-particle scattering off vortices. Science 323, 923–926 (2009). 15. Hanaguri, T., Niitaka, S., Kuroki, K. & Takagi, H. Unconventional s-wave superconductivity in Fe(Se,Te). Science 328, 474–476 (2010). 16. Allan, ...
In the case when the number of defects is of the order of the number of vortices one can expect that they will essentially suppress the magnetic response of the sample and reduce the upper critical field H c3 . If the number of defects is larger than the number of vortices and the ...
When the field is increased and vortices start to enter the sample, the critical current density is determined by the penetration and movement of magnetic vortices. At low magnetic fields, in the Meissner state, the critical current density is dominated by the vortex penetration at the edges of...
Thus, the minimum at f = 0 is explained by the lack of vortices in the array at zero magnetic field. On the other hand, the minima f = 1 and f = 3 correspond to cases where the number of vortices per unit cell is an integer (equal f). In the cases of f being ...
Nowadays, the main approach to increase Jc is the introduction of nanoscaled defects (artificial pinning centres) in the YBCO matrix to immobilize magnetic vortices8,9,10,11,12,13. The total pinning force, Fp=Jc×B, is enhanced by an increased number of elementary pinning sites of optimised ...
Vortices in superconducting nano-networks with anti-dots arrayFigure 2.Flow-resistance measured in NbN thin film shown in Fig.1(a). The resistance is plotted with a reduced magnetic fieldfat various drive-current in the range of 10-100μA andwith the reduced magnetic fieldfat various reduced ...
There are two types of superconducting material: type I superconductors totally exclude magnetic flux penetration and have a low critical field, type II allow flux to penetrate the superconductor above the lower critical field within localized normal regions called flux vortices. They cease to be ...