  Ceramic samples of Sr2RuO(4-y)Sy (y=0.03-1.2) with intended isovalent
substitution of oxygen by sulfur have been synthesized and explored in the
temperature range 4-300K. It is found that at a range of optimum sulfur
substitution the magnetic response of ceramic samples reveals large diamagnetic
signal with amplitudes approaching comparability with that of the
YBCO-superconductors. Contrary to a pure ceramic Sr2RuO4, if properly
optimized, the resistivity of sulfur-substituted samples has a metallic
behavior except at lower temperatures where an upturn occurs. Both synthesis
conditions and results of measurements are reported. The Meissner effect may
point to high-temperature superconductivity.
