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Abstract
Sr2YRu1−uCuuO6 (for 0.05⩽u⩽0.15) has only two types of layers: magnetic YRuO4 layers doped on Ru sites with Cu, and non-magnetic (SrO)2 layers. It superconducts (without cuprate planes) in its SrO layers with an onset temperature of ≈49 K, and with an absolute critical temperature of 23 K, which coincides with the Néel temperature TN at which the Ru moments stop fluctuating. GdSr2Cu2RuO8 and Gd2−zCezSr2Cu2RuO10 also start to superconduct near 49 K, because the SrO layers, not the cuprate planes, superconduct. Four superconductors have been successfully predicted based on this idea. PrBa defects destroy PrBa2Cu3O7’s superconductivity (in the BaO layers). Our muon data show that YBa2Cu3O7 exhibits s-wave or extended s-wave pairing, not d-wave pairing.
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