Physics – Condensed Matter – Superconductivity
Scientific paper
2003-09-13
Physica C Vol.404/1-4 pp289-292 (2004)
Physics
Condensed Matter
Superconductivity
9 pages, 6 figures, submitted to Physica C
Scientific paper
10.1016/j.physc.2003.09.096
We measured the temperature dependence of the 1st and the 3rd harmonics of the AC magnetic susceptibility on some type II superconducting samples at different AC field amplitudes, hAC. In order to interpret the measurements, we computed the harmonics of the AC susceptibility as function of the temperature T, by integrating the non-linear diffusion equation for the magnetic field with different creep models, namely the vortex glass-collective creep (single-vortex, small bundle and large bundle) and Kim-Anderson model. We also computed them by using a non-linear phenomenological I-V characteristics, including a power law dependence of the pinning potential on hAC. Our experimental results were compared with the numerically computed ones, by the analysis of the Cole-Cole plots. This method results more sensitive than the separate component analysis, giving the possibility to obtain detailed information about the contribution of the flux dynamic regimes in the magnetic response of the analysed samples.
Adesso Maria G.
Pace Sandro
Polichetti Massimiliano
Senatore Carmine
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