Reply to Comment on 'Origin of the superconductivity in the Y-Sr-Ru-O and Y-Sr-Cu-O systems'

In their comment on our paper [Galstyan , Phys. Rev. B 76, 014501 (2007)], Blackstead argued that multiphase Sr(2)YRu(0.5)Cu(0.5)O(6-delta) material possesses two distinct superconducting phases and attributed the low-temperature one (similar to 30 K) to the Cu-doped double-perovskite Sr(2)YRuO(6) structure. In this Comment, we show that the superconductivity in Sr(2)YRu(0.5)Cu(0.5)O(6-delta) is apparently attributed to YSr(2)Cu(3)O(7-delta) or YSr(2)Cu(3-x)Ru(x)O(7-delta) phases formed at high temperature during the sintering process. A similar situation may occur with low Cu doping, but further detailed work will certainly be helpful to clarify the physics in Sr(2)YRuO(6) with relatively low Cu concentration.