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Civale, L., and F. de la Cruz. "Anomalous behavior of superconducting samples with a fixed number of vortices." Physical Review B 36, no. 7 (1987): 3560–3564.
Abstract: We report an anomalous reversible temperature dependence of the magnetization of amorphous type-II superconductors. The experimental results were obtained studying the vortex pinning in samples with very low vortex concentration. The anomaly is shown to be a consequence of the lack of flux quantization in finite samples.