scholarly journals Vortex pinning vs superconducting wire network: origin of periodic oscillations induced by applied magnetic fields in superconducting films with arrays of nanomagnets

2014 ◽  
Vol 27 (6) ◽  
pp. 065017 ◽  
Author(s):  
A Gomez ◽  
J del Valle ◽  
E M Gonzalez ◽  
C E Chiliotte ◽  
S J Carreira ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Superconducting Films ◽  
Vortex Pinning ◽  
Periodic Oscillations ◽  
Superconducting Wire

Wire network behaviour of superconducting films with lower symmetrical mesoscopic hole arrays

2021 ◽  
Author(s):  
Guo Wei-Gui ◽  
Pei Zi-Xi ◽  
Qiu Xiang-Gang
Keyword(s):  
Superconducting Films ◽  
Experimental Results ◽  
Hole Density ◽  
Periodic Oscillations ◽  
Large Disk ◽  
Low Field ◽  
Geometric Symmetry ◽  
Hole Arrays

Abstract Superconducting films with the same hole density but different geometric symmetry have been designed and fabricated. The R(H) curves show obvious periodic oscillations with several dips at fractional matching fields. It is found that the period of the oscillations in the low field is not necessary equal to that derived from the hole density, but consistent with that from the corresponding wire networks when the large disk-like film regions are regarded as nodes. The experimental results of R(H), T c (H) and j c (H) at fractional matching fields within the first oscillation also support the rationality of considering films with large-diametered hole arrays as wire networks. Our results demonstrate that the connectivity of superconducting films with large-diametered hole arrays plays a more important role in the oscillations of R(H) curves.

scholarly journals Thickness-modulated tungsten–carbon superconducting nanostructures grown by focused ion beam induced deposition for vortex pinning up to high magnetic fields

2016 ◽  
Vol 7 ◽  
pp. 1698-1708 ◽  
Author(s):  
Ismael García Serrano ◽  
Javier Sesé ◽  
Isabel Guillamón ◽  
Hermann Suderow ◽  
Sebastián Vieira ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Focused Ion Beam ◽  
Vortex Lattice ◽  
Ion Beam ◽  
Electrical Current ◽  
Single Step ◽  
Vortex Pinning ◽  
High Magnetic Fields ◽  
Pinning Potential ◽  
External Stimuli

We report efficient vortex pinning in thickness-modulated tungsten–carbon-based (W–C) nanostructures grown by focused ion beam induced deposition (FIBID). By using FIBID, W–C superconducting films have been created with thickness modulation properties exhibiting periodicity from 60 to 140 nm, leading to a strong pinning potential for the vortex lattice. This produces local minima in the resistivity up to high magnetic fields (2.2 T) in a broad temperature range due to commensurability effects between the pinning potential and the vortex lattice. The results show that the combination of single-step FIBID fabrication of superconducting nanostructures with built-in artificial pinning landscapes and the small intrinsic random pinning potential of this material produces strong periodic pinning potentials, maximizing the opportunities for the investigation of fundamental aspects in vortex science under changing external stimuli (e.g., temperature, magnetic field, electrical current).

The Current Transport Properties of a 200 A-Class Bi-2223 Superconducting Wire at Various Temperatures and Magnetic Fields

2007 ◽  
Vol 17 (2) ◽  
pp. 3113-3116 ◽  
Author(s):  
N. Ayai ◽  
S. Kobayashi ◽  
K. Yamazaki ◽  
S. Yamade ◽  
M. Kikuchi ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Transport Properties ◽  
Current Transport ◽  
Superconducting Wire

Resistance transitions of thin superconducting films in magnetic fields

1962 ◽  
Vol 267 (1329) ◽  
pp. 231-243 ◽  
Keyword(s):  
Magnetic Fields ◽  
Penetration Depth ◽  
Edge Effects ◽  
Superconducting Films ◽  
Tin Films ◽  
Normal Resistance ◽  
Perpendicular Field ◽  
Theoretical Considerations ◽  
Effective Penetration ◽  
Thin Superconducting Films

Resistance transitions of tin films with thicknesses in the range 600 to 10 000 Å have been studied in parallel and perpendicular magnetic fields. The transitions in perpendicular fields are surprisingly sharp, show no sign of a tail at low fields, and are comparatively insensitive to edge effects. The perpendicular field necessary to restore the full normal resistance ( H ⊥ ) is never very different from the bulk critical field ( H c ) even for films as thin as 600 Å. The sharpness of the transition is apparently due to the persistence of a continuous superconducting thread long after the film has become almost completely normal. Simple theoretical considerations suggest that H ⊥ exceeds H c only if the effective penetration depth λ Є exceeds the coherence distance

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