scholarly journals Pengaruh Variasi Dimensi Superkonduktor Berbentuk Persegi Panjang Terhadap Medan Kritis Pada Pada κ = 1,5

2020 ◽  
Vol 5 ◽  
Author(s):  
Alqaan Maqbullah Ilmi ◽  
Cari Cari ◽  
Fuad Anwar
Keyword(s):  
Equilibrium State ◽  
Critical Field ◽  
Time Dependent ◽  
Type Ii ◽  
Ginzburg Landau ◽  
Rectangular Shape ◽  
Type Ii Superconductor ◽  
Tdgl Equation

<p class="AbstractEnglish"><strong>Abstract:</strong> The Time Dependent Ginzburg-Landau (TDGL) equation can be used to study the characteristics of a superconductor in the evolution of time until it reaches an equilibrium state. This study uses the ѰU method to calculate the critical field value numerically which has been tested stable and consistent. Previous research has been carried out regarding the critical field ratio of rectangular and rectangular superconductors with the same area at κ = 1.5. This research examines the variation of the dimensions of the type II superconductor with a rectangular shape, then it is found that the critical field of the Hc<sub>3</sub> surface forms a pattern that can be used to study the characteristics of the type II superconductor.</p><p class="AbstrakIndonesia"><strong>Abstrak: </strong>Persamaan Ginzburg-Landau Gayut Waktu (Time Dependent Ginzburg-Landau/TDGL) dapat digunakan untuk mempelajari karakteristik superkonduktor dalam evolusi waktu sampai mencapai keadaan setimbang. Penelitian ini menggunakan metode ѰU untuk menghitung nilai medan kritis secara numerik yang telah teruji stabil dan konsisten. Telah dilakukan penelitian sebelumnya mengenai perbandingan medan kritis superkonduktor berbentuk persegi dan persegi panjang dengan luas sama pada κ = 1,5. Dalam penelitian ini dikaji variasi dimensi superkonduktor tipe II dengan bentuk persegi panjang, kemudian didapatkan bahwa medan kritis permukaan Hc<sub>3</sub> membentuk pola yang dapat digunakan untuk mempelajari karakteristik superkonduktor tipe II.</p>

scholarly journals Comparison of the superconducting rectangular critical fields with the same area at κ = 1.5

2019 ◽  
Vol 3 (2) ◽  
pp. 62
Author(s):  
Fuad Anwar ◽  
C Cari ◽  
Alqaan Maqbullah Ilmi
Keyword(s):  
Critical Field ◽  
Proximity Effects ◽  
Time Dependent ◽  
Type Ii ◽  
Critical Fields ◽  
Ginzburg Landau ◽  
Type Ii Superconductor ◽  
Tdgl Equation

<span>The Time Dependent Ginzburg-Landau (TDGL) equation can be used to study the characteristics of superconductors in the evolution of time to reach equilibrium. This study uses the <em>ѰU</em> method to numerically calculate critical field values more easily. Previous research has been carried out on size variations, kappa variations, proximity effects and so on. In this study, a comparison between squares and rectangles with the same size of area for type II superconductor , then it is found that the critical field Hc<sub>3</sub> is the same value for each of the same area.</span>

The Nernst effect in layered superconductors under a magnetic field

2016 ◽  
Vol 30 (22) ◽  
pp. 1650281 ◽  
Author(s):  
Bui Duc Tinh ◽  
Le Minh Thu ◽  
Nguyen Quang Hoc
Keyword(s):  
Thermal Noise ◽  
Gaussian Approximation ◽  
Landau Levels ◽  
Recent Experimental Data ◽  
Type Ii ◽  
Nernst Effect ◽  
Ginzburg Landau ◽  
Type Ii Superconductor ◽  
Self Consistent ◽  
Tdgl Equation

We calculated the Nernst signal [Formula: see text], describing the Nernst effect in type-II superconductor in the vortex–liquid regime, by using the time-dependent Ginzburg–Landau (TDGL) equation with thermal noise. The nonlinear interaction term in the TDGL equation is treated within self-consistent Gaussian approximation. The expression of the Nernst signal [Formula: see text] including all the Landau levels is presented in explicit form which is applicable essentially to the whole phase. Our results are compared with the recent experimental data on high-[Formula: see text] superconductor.

scholarly journals Large enhancement of conductivity in a strongly layered type-II superconductor with an artificial pinning array

2020 ◽  
Vol 2020 (4) ◽  
Author(s):  
Bui Duc Tinh
Keyword(s):  
Landau Equation ◽  
Thermal Fluctuations ◽  
Energy Scale ◽  
Time Dependent ◽  
Type Ii ◽  
Ginzburg Landau ◽  
Fluctuation Conductivity ◽  
Ginzburg Landau Equation ◽  
Type Ii Superconductor ◽  
Large Enhancement

Abstract We use the time-dependent Ginzburg–Landau equation to describe a type-II superconductor in a magnetic field in the presence of both strong thermal fluctuations and an artificial pinning array. Thermal fluctuations are represented by the Langevin white noise. The layered structure of the superconductor is taken into accounted with the Lawrence–Doniach model. The self-consistent Gaussian approximation is used to treat the nonlinear interaction term in the time-dependent Ginzburg–Landau equation. In the case of the $\delta $-function model for the pinning centers and the matching field, analytic expressions for the fluctuation electrical and thermoelectric conductivity are obtained. It is found that the fluctuations in electrical and thermoelectric conductivities increase with increasing pinning strength, and when the pinning strength comes near a critical value, the fluctuation conductivity is greatly enhanced. Our result shows that if a pinning array is added to a mixed state superconductor, the original properties of the superconductor are recovered. Physically, in the presence of thermal fluctuations, when the energy scale of the vortex lattice shear fluctuations becomes comparable to the pinning energy scale there is a large enhancement of the fluctuation conductivity in the presence of pinning.

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