Abstract
The magnetic superconductor FeSr2YCu2O6+y exhibits superconductivity below 59 K, only when it is properly annealed in a N2 flow and subsequently annealed in an O2 flow and under high O2 pressure. FeSr2LnCu2O6+y (Ln = Nd, Eu, Gd and Tb), where Ln is substituted for Y, was also studied. While FeSr2GdCu2O6+y and FeSr2EuCu2O6+y show superconductivity below 37 K and 31 K, respectively, FeSr2NdCu2O6+y and FeSr2TbCu2O6+y do not show superconductivity. A peak was observed at 20 K in the temperature dependence of susceptibility under a magnetic field of 1 T for FeSr2YCu2O7.65, and this implies the magnetic order of the Fe ion. To study the magnetism of the Fe ion in FeSr2YCu2O7.65, non-superconducting FeSr2Y(Cu0.95Zn0.05)2O7.65 was studied. The magnetism of the Fe ion is mainly antiferromagnetic.
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