Angular dependence of the critical magnetic field in granular superconducting films

1973 ◽  
Vol 11 (1-2) ◽  
pp. 173-180 ◽  
Author(s):  
T. Aomine ◽  
L. Rinderer
Keyword(s):  
Magnetic Field ◽  
Angular Dependence ◽  
Superconducting Films ◽  
Critical Magnetic Field

Superconductors with spin–orbit interactions

2016 ◽  
Vol 30 (25) ◽  
pp. 1650183 ◽  
Author(s):  
Yu. N. Ovchinnikov
Keyword(s):  
Magnetic Field ◽  
Superconducting Films ◽  
Critical Magnetic Field ◽  
Spin Orbit ◽  
Zero Temperature ◽  
Interband Pairing ◽  
Two Parameters ◽  
Spin Orbit Interactions ◽  
Parameter Values ◽  
Thin Superconducting Films

The effect of spin-orbit (SO) interaction on the formation of the critical states in thin superconducting films in magnetic field oriented along the film is investigated. Hereby, the case of interband pairing is considered. It was found that eight branches exist in the plane of two parameters [Formula: see text] determined by the value of magnetic field and SO interaction. Six modes leads to inhomogeneous states with different values of the impulse [Formula: see text]. Each state is doubly degenerate over direction of impulse [Formula: see text]. The parameter values at critical point are found for all eight branches in explicit form for zero temperature. The optimal two branches are estimated, corresponding to largest critical magnetic field value for given SO interaction.

scholarly journals Critical Magnetic Field of Ultra-Thin Superconducting Films and Interfaces

2017 ◽  
Vol 86 (8) ◽  
pp. 083701 ◽  
Author(s):  
Gertrud Zwicknagl ◽  
Simon Jahns ◽  
Peter Fulde
Keyword(s):  
Magnetic Field ◽  
Superconducting Films ◽  
Critical Magnetic Field ◽  
Thin Superconducting Films

scholarly journals Effect of geometrical symmetry on the angular dependence of the critical magnetic field in superconductor/normal metal multilayers

2005 ◽  
Vol 72 (2) ◽  
Author(s):  
S. L. Prischepa ◽  
C. Cirillo ◽  
V. N. Kushnir ◽  
E. A. Ilyina ◽  
M. Salvato ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Angular Dependence ◽  
Critical Magnetic Field ◽  
Normal Metal ◽  
Geometrical Symmetry

scholarly journals Температурные зависимости критических параметров неоднородных сверхпроводящих пленок

2021 ◽  
Vol 63 (8) ◽  
pp. 1035
Author(s):  
П.И. Безотосный ◽  
К.А. Дмитриева
Keyword(s):  
Magnetic Field ◽  
Critical Temperature ◽  
External Magnetic Field ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Superconducting Films ◽  
Critical Magnetic Field ◽  
Temperature Dependences ◽  
Comparison Of The Results

The results of calculating the temperature dependences of the critical current density and critical magnetic field of thin inhomogeneous superconducting films are presented. Comparison of the results obtained for inhomogeneous films with the results of calculations for homogeneous ones showed that in both cases, the decrease in the critical magnetic field occurs according to the root law, and the critical current density changes according to a power law with a degree of 3/2 when approaching the critical temperature. Quantitatively, the critical current density for inhomogeneous films in the absence of an external magnetic field is lower than for homogeneous ones. In turn, the critical magnetic field of inhomogeneous films is much larger than the critical field of homogeneous films.

Superconducting Fractal Multilayers

Fractals ◽  
1997 ◽  
Vol 05 (supp02) ◽  
pp. 101-117
Author(s):  
A. S. Sidorenko
Keyword(s):  
Magnetic Field ◽  
Angular Dependence ◽  
Fractal Dimensionality ◽  
High Energy ◽  
Critical Magnetic Field ◽  
Superconducting Film ◽  
Two Dimensional ◽  
Layered Superconductors ◽  
Upper Critical Magnetic Field ◽  
Critical Magnetic Fields

The influence of fractal geometry on superconductivity has been studied for layered superconductors. Superconducting multilayers consisting of alternating Nb and Cu layers with fractal stacking sequence and fractal dimension Df=0.63 including the two limiting cases Df= 0 (single superconducting film) and Df=1 (periodic multilayers) were prepared by electron-beam evaporation in ultrahigh vacuum. The layers of Nb and Cu were put down alternately via computer control of the target shutter. The structure of the samples has been checked with in situ reflection high-energy electron diffraction (RHEED) and Auger depth profiling, confirmed the prescribed layering geometry. Superconductivity was investigated by measurements of the critical temperature of superconducting transition Tc, and of the temperature and of the angular dependence of the upper critical magnetic fields Bc2. The observed dependences of Tc on the parameters of fractal samples are in a good qualitative agreement with the proximity effect theory developed for layered superconductors with a self-similar fractal structure. The behavior of the upper critical magnetic field is directly related to the type of the layering. At low temperatures, all samples show the same two-dimensional behavior essentially governed by the topological dimension of the individual superconducting layers, independent of the fractal dimensionality Df of the samples, whereas for temperatures near Tc the type of layering determines the dimensionality, resulting in a multicrossover behavior of fractal samples. The angular dependence of the upper critical magnetic field Bc2(θ) of fractals corresponds to the theory for a two-dimensional superconductor at all temperatures, reflecting the multicrossover behavior of the fractal multilayers, as long as the temperature-dependent coherence length is comparable with a certain scale of fractal.

MAGNETIC EFFECTS AND CURRENT SENSITIVITY OF SUPERCONDUCTING FILMS

1936 ◽  
Vol 14a (2) ◽  
pp. 25-37 ◽  
Author(s):  
A. D. Misener
Keyword(s):  
Magnetic Field ◽  
Critical Field ◽  
Threshold Current ◽  
Superconducting Films ◽  
Anomalous Behavior ◽  
Critical Magnetic Field ◽  
Threshold Field ◽  
Current Sensitivity ◽  
Transition Points ◽  
Different Diameters

The work described in this paper is a continuation of the investigation of the anomalous behavior of superconducting metals in the form of thin films (12.2–0.3 μ). The manner in which an external magnetic field will penetrate when applied to superconducting films of various thicknesses at a variety of temperatures below their transition points has been studied. It is found that there is a critical field that will penetrate the film, and that this field is less than the threshold field required to restore the resistance of the film at the same temperature. Even for fields much larger than the threshold field, the films act as partial magnetic shields and diminish the field strength by an almost constant amount.By measuring the current required to restore the resistance of films formed on cylindrical supports of different diameters, it is shown that their current sensitivity is due to a surface density of current. The critical magnetic field associated with this threshold current is less than either the threshold field (external) or the critical field for penetration. The similarity between these effects and those found for certain superconducting alloys is discussed.

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