The intrinsic crossing point of the magnetization


The crossing point of the magnetization vs. temperature curves that appears below Tc in highly anisotropic superconducting cuprates was measured in different compounds, with a different number, N, of superconducting $\rm CuO_2$ layers per periodicity length, s, and also with different values of s. By correcting the measurements from different extrinsic inhomogeneity effects through the Meissner fraction, it is demonstrated experimentally for the first time that in the high-magnetic-field limit the intrinsic crossing point may be explained at a quantitative level in terms of the Tesanović and coworkers approach based on thermal fluctuations of quasi-2D vortices (pancakes), with an effective periodicity length equal to s, independently of N