نتایج جستجو برای: superconducting critical field
تعداد نتایج: 1243945 فیلتر نتایج به سال:
Nanosized Pb junctions exhibit superconducting correlations at magnetic fields more than an order of magnitude higher than the zero-temperature critical field of the bulk Pb. The strongly enhanced critical field is a spectacular demonstration of nanosize effect where the Meissner screening currents become ineffective for junction’s tip smaller than the London penetration depth (32 nm for Pb). F...
In this paper, we discuss the vortex structure of the superconducting thin films placed in a magnetic field. The discussion is based on a system of simplified Ginzburg–Landau equations. We obtain the estimate for the lower critical magnetic field Hc1 , in the sense that it is the first critical value of hex, the applied field, for which the minimal energy among vortexless configurations is equa...
2014 Network equations for finite and extended superconducting arrays are studied in the presence of external currents. Critical currents are obtained for typical network geometries. In the presence of a magnetic field, the critical currents are shown to be very sensitive to the underlying topology of the network. This is illustrated through explicit calculations on an extended square network. ...
As a first step to a better understanding of the voltage-current characteristics of fine filament multifi lamentary composite superconductors, the electric field and critical current along a single spiral-shaped fi lament were studied. When the spiral superconducting filament was carrying constant current and placed in a magnetic field, the local critical current and electric field vary due to ...
Upper critical field H c2 and Hall coefficient R H in superconducting per-ovskite M gCN i 3 have been studied. The normal state ρ(T) behavior is similar to that observed in oxide perovskite (Ba, K)BiO 3 (BKBO), in which ρ(T) fits well curve predicted by Bloch-Grüneisen theory consistently with electron-phonon scattering. H c2 (T), determined from the onset of the resis-tive superconducting tran...
The critical state of the vortex lattice in a thin strip is considered for the case when first a perpendicular magnetic field is applied, then a longitudinal field, and then again the perpendicular field is increased. This longitudinal field can strongly enhance the critical currents in the strip since the vortices are inclined and the currents flow in the strip plane.
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