Abstract
A new method designed to determine flux pinning potential U o is described. The method is simply a measurement of flux jump at either constant temperature or constant field. At 4.3 K, we recorded the large hysteresis loop with several flux jumps by sweeping fields up to 8 Tesla for a Tl 2Ba 2Ca 2Cu 3O x sample. At 0.03 Tesla, we recorded also a temperature dependence of magnetization in temperatures between 60 K and 130 K in a cooling approach described in text and found flux jump as well. Based on the GL theory, these flux jumps are analyzed and U o of 1 eV at the both cases have been obtained for the polycrystalline Tl 2Ba 2Ca 2Cu 3O x sample. These are larger than the reported thermal activation energy for cuprate superconductors remarkably. Some relevant issues are discussed.
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