Numerical analysis of magnetization processes in type II superconductors based on Ginzburg-Landau theory

1996 ◽  
Vol 32 (3) ◽  
pp. 1156-1159 ◽  
Author(s):  
K. Demachi ◽  
Y. Yoshida ◽  
H. Asakura ◽  
K. Miya
Keyword(s):  
Numerical Analysis ◽  
Landau Theory ◽  
Type Ii ◽  
Ginzburg Landau ◽  
Type Ii Superconductors ◽  
Magnetization Processes

MAGNETIC FIELD DEPENDENCE OF ENTROPY AND SPECIFIC HEAT OF YBa2Cu3O7-δ SUPERCONDUCTORS

2012 ◽  
Vol 26 (02) ◽  
pp. 1250051 ◽  
Author(s):  
B. KALTA ◽  
P. NAYAK ◽  
K. K. NANDA
Keyword(s):  
Magnetic Field ◽  
Specific Heat ◽  
Magnetic Field Dependence ◽  
Landau Theory ◽  
Thermodynamic Quantities ◽  
Type Ii ◽  
Large Reduction ◽  
Superconducting Transition ◽  
Ginzburg Landau ◽  
Type Ii Superconductors

The change in thermodynamic quantities (e.g., entropy, specific heat etc.) by the application of magnetic field in the case of the high-Tc superconductor YBCO system is examined phenomenological by the Ginzburg–Landau theory of anisotropic type-II superconductors. An expression for the change in the entropy (ΔS) and change in specific heat (ΔC) in a magnetic field for any general orientation of an applied magnetic field Ba with respect to the crystallographic c-axis is obtained. The observed large reduction of specific heat anomaly just below the superconducting transition and the observed variation of entropy with magnetic field are explained quantitatively.

SPINNING VORTICES IN TYPE II SUPERCONDUCTORS

1990 ◽  
Vol 05 (12) ◽  
pp. 955-963 ◽  
Author(s):  
R. L. DAVIS
Keyword(s):  
Landau Theory ◽  
Gauge Fields ◽  
Type Ii ◽  
Duality Transformation ◽  
Ginzburg Landau ◽  
Flux Tubes ◽  
Type Ii Superconductors ◽  
Type Ii Superconductivity ◽  
The Relationship ◽  
Field Theoretical Model

A field-theoretical model displaying macroscopic type II superconductivity involves electromagnetic and antisymmetric tensor gauge fields interacting in a special background. Vortex lines are represented by Kalb-Ramond strings, and the force law for a vortex in a supercurrent follows naturally. It is shown by a duality transformation that this theory is equivalent to the low-energy sector of a spontaneously broken abelian Higgs model, but the existence of a charged background changes the nature of the symmetry breaking. As a result, it is not Neilsen-Olesen solutions but rather the spinning vortices which describe the macroscopic properties of flux tubes in a superconductor. The relationship with Ginzburg-Landau theory is briefly discussed.

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.

scholarly journals Effect of intensity and size of defect on Ginzburg-Landau free energy for type II superconductors

2020 ◽  
Author(s):  
Dyah Eka Puspitasari ◽  
Nizar Rahmanda Hardiyanto ◽  
Eny Latifah ◽  
Hari Wisodo
Keyword(s):  
Free Energy ◽  
Type Ii ◽  
Ginzburg Landau ◽  
Type Ii Superconductors ◽  
Landau Free Energy
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