Abstract
We performed resistivity and magnetization measurements on the ruthenocuprates (Ru 1− x Nb x )Sr 2(Gd 1.4Ce 0.6)Cu 2O z ( x = 0–0.5) and (Ru 0.5Nb 0.5)Sr 2(Gd 1.5− y Eu y Ce 0.5)Cu 2O z ( y = 0–1.5). It is found that the Nb substitution for Ru depresses superconductivity only slightly from T c = 27 K for x = 0 to T c = 24 K for x = 0.5, but significantly reduces the ferromagnetic component. In contrast to the Nb-free sample, a partial evolution of the Meissner state followed by a reentrance of the magnetization is observed in the field-cooled magnetization measurements of the Nb-doped samples. The magnetization measurements on the (Ru 0.5Nb 0.5)Sr 2(Gd 1.5− y Eu y Ce 0.5)Cu 2O z system indicate that the reentrant behavior of the magnetization below T c is caused by the paramagnetic contribution of the Gd 3+ ions and the Meissner effect can be seen more clearly after suppressing the paramagnetic response of the sublattice of Gd 3+ ions.
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