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Oxygen stoichiometry and flux creep activation energy YBa2Cu3Ox

The flux-creep activation energy Uo has been obtained by using Arrhenius plots for polycrystalline YBa2Cu3Ox for various oxygen stoichiometries. An exponential relationship between Uo and x has been established for different applied magnetic fields. This relationship can be used to explain the resistive transition broadening for samples with different oxygen concentrations. The observed field dependence of Uo suggests the existence of 90 K and 60 K superconductors.