Browsing by Author "Tinh, B. D."

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Nernst Signal in High-T(c) Superconductors
(2010-07-01)
Tinh, B. D.
;
Rosenstein, B.
;
電子物理學系
;
Department of Electrophysics
The time-dependent Ginzburg Landau equation with thermal noise is used to calculate the Nernst signal e(N), describing the Nernst effect, in type-II superconductor in the vortex-liquid regime. The Gaussian method used is an elaboration of the Hartree-Fock method. An additional assumption often made in analytical calculations that only the lowest Landau level significantly contributes to physical quantities of interest in the high-field limit is lifted by including all the Landau levels. The values of eN are in good quantitative agreement with experimental data for temperature close to T(c) on Bi(2)Sr(2)CaCu(2)O(8+delta) and Bi(2)Sr(2)Ca(2)Cu(3)O(10+delta).
Nernst Signal in High-T-c Superconductors
(2010-07-01)
Tinh, B. D.
;
Rosenstein, B.
;
電子物理學系
;
Department of Electrophysics
The time-dependent Ginzburg Landau equation with thermal noise is used to calculate the Nernst signal e(N), describing the Nernst effect, in type-II superconductor in the vortex-liquid regime. The Gaussian method used is an elaboration of the Hartree-Fock method. An additional assumption often made in analytical calculations that only the lowest Landau level significantly contributes to physical quantities of interest in the high-field limit is lifted by including all the Landau levels. The values of eN are in good quantitative agreement with experimental data for temperature close to T-c on Bi2Sr2CaCu2O8+delta and Bi2Sr2Ca2Cu3O10+delta.
Theory of Nernst Effect in Layered Superconductors
(2009)
Tinh, B. D.
;
Rosenstein, B.
;
電子物理學系
;
Department of Electrophysics
We calculate, using the time-dependent Ginzburg-Landau (TDGL) equation with thermal noise, the transverse thermoelectric conductivity alpha(xy), describing the Nernst effect, in type-II superconductor in the vortex-liquid regime. The method is an elaboration of the Hartree-Fock. An often made in analytical calculations additional assumption that only the lowest Landau level significantly contributes to alpha(xy) in the high field limit is lifted by including all the Landau levels. The resulting values in two dimensions (2D) are significantly lower than the numerical simulation data of the same model, but are in reasonably good quantitative agreement with experimental data on La(2)SrCuO(4) above the irreversibility line (below the irreversibility line at which alpha(xy) diverges and theory should be modified by including pinning effects)