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We show that the self-organized criticality of the Bean's state in each ofthe grains of a granular superconductor results in magneto-thermal oscillationspreceding a series of subsequent flux jumps. We find that the frequency ofthese oscillations is proportional to the external magnetic field sweep rateand is inversely proportional to the square root of the heat capacity. Wedemonstrate experimentally and theoretically the universality of thisdependence that is mainly influenced by the granularity of the superconductor.Comment: submitted to Physical Review Letters, 4 pages, RevTeX, 4 figures  available as uufile

Self-organized criticality effect on stability: magneto-thermal oscillations in a granular YBCO superconductor