scholarly journals Thermally activated dynamics of spontaneous perpendicular vortices tuned by parallel magnetic fields in thin superconducting films

2012 ◽  
Vol 86 (2) ◽  
Author(s):  
Milind N. Kunchur ◽  
Manlai Liang ◽  
Alex Gurevich
Keyword(s):  
Magnetic Fields ◽  
Superconducting Films ◽  
Thermally Activated ◽  
Thin Superconducting Films ◽  
Parallel Magnetic Fields

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

Characterization of Y-Ba-Cu-O films grown on silicon substrates by sequential evaporation

1988 ◽  
Vol 46 ◽  
pp. 866-867
Author(s):  
E. L. Hall ◽  
A. Mogro-Campero ◽  
L. G. Turner ◽  
N. Lewis
Keyword(s):  
Thin Film ◽  
Thin Film Deposition ◽  
Superconducting Films ◽  
Electron Beam Evaporation ◽  
Film Deposition ◽  
Silicon Substrates ◽  
Superconducting Properties ◽  
Sequential Electron ◽  
Thin Superconducting Films

There is great interest in the growth of thin superconducting films of YBa2Cu3Ox on silicon, since this is a necessary first step in the use of this superconductor in a variety of possible electronic applications including interconnects and hybrid semiconductor/superconductor devices. However, initial experiments in this area showed that drastic interdiffusion of Si into the superconductor occurred during annealing if the Y-Ba-Cu-O was deposited direcdy on Si or SiO2, and this interdiffusion destroyed the superconducting properties. This paper describes the results of the use of a zirconia buffer layer as a diffusion barrier in the growth of thin YBa2Cu3Ox films on Si. A more complete description of the growth and characterization of these films will be published elsewhere.Thin film deposition was carried out by sequential electron beam evaporation in vacuum onto clean or oxidized single crystal Si wafers. The first layer evaporated was 0.4 μm of zirconia.

ANISOTROPIC VORTEX DYNAMICS AND PHASE DIAGRAM OF YBa2Cu3O7 SINGLE CRYSTALS WITH CANTED COLUMNAR DEFECTS

1996 ◽  
Vol 10 (22) ◽  
pp. 2723-2743 ◽  
Author(s):  
D. S. REED ◽  
N.-C. YEH ◽  
W. JIANG ◽  
U. KRIPLANI ◽  
M. KONCZYKOWSKI ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Magnetic Fields ◽  
Vortex Dynamics ◽  
Flow Model ◽  
Flux Flow ◽  
Thermally Activated ◽  
Liquid Transition ◽  
Columnar Defects ◽  
Thermally Activated Flux Flow ◽  
Activated Flux

The anisotropic vortex dynamics and phase diagram are determined for a YBa 2 Cu 3 O 7 single crystal with columnar defects oriented at ±7.5° relative to the crystalline c-axis. A second-order splayed-glass to vortex-liquid transition is manifested for magnetic fields nearly parallel to the columns via the critical scaling of vortex AC and DC transport properties. In contrast, for magnetic fields aligned close to the ab-plane, an XY-like vortex-glass transition prevails. For magnetic fields at intermediate angles, there is no evidence of any vortex phase transition, and the vortex dynamics is described in terms of the thermally activated flux flow model.

Electron energy down-conversion in thin superconducting films

2007 ◽  
Vol 75 (9) ◽  
Author(s):  
A. G. Kozorezov ◽  
J. K. Wigmore ◽  
D. Martin ◽  
P. Verhoeve ◽  
A. Peacock
Keyword(s):  
Electron Energy ◽  
Superconducting Films ◽  
Down Conversion ◽  
Thin Superconducting Films
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