Abstract
FeSr2YCu2O6+δ exhibits superconductivity around 50 K, only when it is annealed in N2 and subsequently oxidized. While N2-annealing prevents disorder of Cu and Fe, oxidizing supplies the carrier to the superconducting CuO2 sheets. Although this compound has the similar structure to Ba2YCu3O6+δ, the substitution effect is different from Ba2YCu3O6+δ. The substitution of lanthanoid with larger ionic radius for Y causes the disorder of Cu and Fe, and the introduction of interstitial oxygen. Therefore, since the CuO2 sheets becomes disordered, Tc decreases. Meanwhile, the Co-substituted compound has the order of Cu and Fe before the N2-annealing. However, it does not exhibit superconductivity by the oxidizing because the oxidizing is not effective on the supply of oxygen.
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