  We report on the structural, magnetic, and Raman-scattering studies of double
perovskite structure Sr2Y(Ru1-xCux)O6-d systems made by systematic synthesis
processes with various numbers of doping concentrations and sintering
temperatures. We observed different behaviors resulting from the different
thermal treatments. In particular, superconductivity in Cu-doped Sr2YRuO6 has
been observed only for partially melted ceramic materials. We show that
superconductivity is associated with the 1:2:3 phase (YSr2Cu3Ot), similar to
that of Y-Sr-Cu-O samples sintered at high temperature.
