Effects of thermal fluctuations on the magnetic behavior of mesoscopic superconductors
A. D. Hernández, B. J. Baelus, D. Domínguez, F. M. Peeters
DOI 10.1103/PhysRevB.71.214524 · Physical Review B
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Abstract
We study the influence of thermal fluctuations on the magnetic behavior of square mesoscopic superconductors. The strength of thermal fluctuations are parametrized using the Ginzburg number, which is small (Gi≈10−10) in low-Tc superconductors and large in high-Tc superconductors (Gi≈10−4). For low-Tc mesoscopic superconductors we found that the metastable 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-Tc mesoscopic superconductors where thermally activated vortex entrance∕exit through surface barriers is frequent. This leads to a reduction of the magnetization and a noninteger 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.
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