Ginzburg-Landau theory of the transition at Hc(2)in thin film superconductors

1975 ◽  
Vol 5 (12) ◽  
pp. 2318-2329
Author(s):  
J B Parkinson
Keyword(s):  
Thin Film ◽  
Landau Theory ◽  
Ginzburg Landau

Superconducting state in a circular SQUID shaped mesoscopic film

2014 ◽  
Vol 28 (29) ◽  
pp. 1450230
Author(s):  
J. Barba-Ortega ◽  
Jose L. Aguilar ◽  
Jesús D. González
Keyword(s):  
Thin Film ◽  
Boundary Conditions ◽  
Superconducting State ◽  
Magnetization Curve ◽  
Order Parameter ◽  
Landau Theory ◽  
Time Dependent ◽  
Ginzburg Landau ◽  
Mesoscopic Superconductor ◽  
Parameter Profile

Using a thin-film approach to the time-dependent Ginzburg–Landau theory, we have studied the magnetization and order parameter profile in a thin mesoscopic superconductor in the so-called SQUID geometry. Our sample is circular with a hole at the center connected to the outer rim by a very thin slit. We have also studied the influence of the boundary conditions in the thin slit on the magnetization curve of the sample.

Two-band study on electromagnetic properties of Co-doped superconducting BaFe2As2 thin films

2021 ◽  
pp. 2150376
Author(s):  
Chen-Xiao Ye ◽  
Jian-Tao Che ◽  
Hai Huang
Keyword(s):  
Thin Film ◽  
Critical Field ◽  
Landau Theory ◽  
Upper Critical Field ◽  
Neumann Boundary ◽  
Pairing Symmetry ◽  
Electromagnetic Properties ◽  
Ginzburg Landau ◽  
Analytic Expressions ◽  
Co Doped

Identifying the form of the superconducting order parameter in the Co-doped BaFe2As2 thin film is still an unsolved problem. With the Neumann boundary condition, we study the electromagnetic properties of this thin film based on the two-band Ginzburg–Landau theory. We get the analytic expressions for the upper critical field in arbitrary direction and the temperature dependence of critical supercurrent density through the film. Our theoretical results can fit the experimental data of upper critical field and critical supercurrent density well, which thus strongly suggests the Co-doped BaFe2As2 thin film as a two-gap [Formula: see text]-wave superconductor. Besides, a trijunction experiment is proposed to probe the [Formula: see text]++ or [Formula: see text] pairing symmetry in this material.

scholarly journals Possible Alterations of Local Gravitational Field Inside a Superconductor

Entropy ◽  
2021 ◽  
Vol 23 (2) ◽  
pp. 193 ◽  
Author(s):  
Giovanni Alberto Ummarino ◽  
Antonio Gallerati
Keyword(s):  
Gravitational Field ◽  
Landau Theory ◽  
Time Dependent ◽  
Qualitative Comparison ◽  
Ginzburg Landau ◽  
High Tc ◽  
Gravitational Fields ◽  
Favorable Conditions

We calculate the possible interaction between a superconductor and the static Earth’s gravitational fields, making use of the gravito-Maxwell formalism combined with the time-dependent Ginzburg–Landau theory. We try to estimate which are the most favorable conditions to enhance the effect, optimizing the superconductor parameters characterizing the chosen sample. We also give a qualitative comparison of the behavior of high–Tc and classical low–Tc superconductors with respect to the gravity/superfluid interplay.

scholarly journals Different length scales for order parameters in two-gap superconductors: Extended Ginzburg-Landau theory

2011 ◽  
Vol 84 (6) ◽  
Author(s):  
L. Komendová ◽  
M. V. Milošević ◽  
A. A. Shanenko ◽  
F. M. Peeters
Keyword(s):  
Landau Theory ◽  
Order Parameters ◽  
Ginzburg Landau ◽  
Length Scales

Ginzburg–Landau theory of the Abrikosov vortex state near the upper critical field

1982 ◽  
Vol 60 (3) ◽  
pp. 299-303 ◽  
Author(s):  
A. E. Jacobs
Keyword(s):  
Critical Field ◽  
Landau Theory ◽  
Upper Critical Field ◽  
Vortex State ◽  
Quantization Condition ◽  
Abrikosov Vortex ◽  
Ginzburg Landau ◽  
Type Ii Superconductors ◽  
Flux Quantization ◽  
The Magnetic Field

A method which preserves the flux-quantization condition in all orders of perturbation theory is applied to the Ginzburg–Landau theory of type-II superconductors near the upper critical field. Expansions are obtained for the order parameter, the magnetic field, and the free energy; previous results are verified and extended to one higher order in Hc2 – Ha.

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