Abstract
We report the thermal history dependence of the superconducting properties in the ceramic La2CuO4+δ with excess oxygen. In the sample, annealed in high pressure oxygen gas, the transition temperatureT c onset of 32K in rapidly cooling case changes into 37K in case of annealing at 200K. Another superconducting phase withT c around 45K was found to be enhanced in the samples annealed around 220K, both in the de susceptibility and resistivity measurements. We also studied thermal history dependence in the samples with electrochemical oxidation. And we observed theT c onset of 45K, however theT c onset of 45K did not change by thermal history.
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