Abstract
The Ru-1232 compounds have been synthesized in the (Ru1−xNbx)Sr2(GdCe1.8Sr0.2)Cu2Oz system, and effects of Nb substitution for Ru on superconductivity and ferromagnetism of the Ru-1232 compounds have been investigated. First, X-ray powder diffraction study shows that nearly the single 1232 phase samples can be obtained in the x composition range from 0.0 to 0.3. Then, from the electrical resistivity study, it is found that each of the samples shows resistivity dropping phenomenon at two temperatures of Tcl and Tch, which originates from superconductivity of the Ru-1232 phase and the Ru-1222 one, respectively. Both of the starting temperatures are lowering with increasing Nb content x. Lastly, from the magnetic susceptibility study, it is found that superconducting transition temperature Tc is 20 K for the Ru-1232 sample with x = 0.0 and the ferromagnetic transition temperature Tm is about 90 K. This study also shows that both of the values of Tc and Tm become low with increasing x from 0.0 to 0.3.
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