Physics – Condensed Matter – Superconductivity
Scientific paper
2005-04-21
Phys. Rev. B 71, 214524 (2005)
Physics
Condensed Matter
Superconductivity
9 pages, 6 figures, submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.71.214524
We study the influence of thermal fluctuations on the magnetic behavior of square mesoscopic superconductors. The strength of thermal fluctuations are parameterized using the Ginzburg number, which is small ($G_i \approx 10^{-10}$) in low-$T_c$ superconductors and large in high-$T_c$ superconductors ($G_i \approx 10^{-4}$). For low-$T_c$ mesoscopic superconductors we found that the meta-stable states due to the surface barrier have a large half-life time, which leads to the hysteresis in the magnetization curves as observed experimentally. A very different behavior appears for high-$T_c$ mesoscopic superconductors where thermally activated vortex entrance/exit through surface barriers is frequent. This leads to a reduction of the magnetization and a non-integer average number of flux quanta penetrating the superconductor. The magnetic field dependence of the probability for the occurrence of the different vortex states and the fluctuations in the number of vortices are studied.
Baelus B. J.
Dominguez Daniel
Hernandez Alexander D.
Peeters François M.
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