Abstract
We have investigated effects of the lanthanide element Ln and the composition changes on the superconducting transition temperature T c in the Ru-1232 system, RuSr2(Gd1− x Ln x Ce1.8Sr0.2)Cu2O z (Ln = Sm, Dy, and Ho). At first, in the case of the samples with Ln = Sm among almost the single 1232 phase samples, the values of the superconducting onset temperature T co are almost the same for x = 0.00–0.15, and each of the lattice parameters a and c is almost constant. While, in each of the cases of the samples with Ln = Dy and Ho, the sample with x = 0.05 shows the maximum values for both the superconducting onset temperature T co and the zero resistivity temperature T cz. Especially for the sample with Ln = Dy, the values of T co and T cz are 18.5 and 6.5 K, respectively. These are higher than those of the mother sample of RuSr2(GdCe1.8Sr0.2)Cu2O z . Moreover, from variations of T co, lattice parameters of a and c in the RuSr2(Gd1− x Dy x Ce1.8Sr0.2)Cu2O z system as a function of Dy content x, the relationship between the superconducting transition temperature and the lattice parameters in the present system are investigated.
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