Sr{sub}2YRuO{sub}6 and Ba{sub}2YRuO{sub}6, both doped with Cu on Ru sites, superconduct at onset temperatures of ～49 and ～93 K, despite having no cuprate planes. Sr{sub}2YRuO{sub}3 has two sister cuprate compounds, GdSr{sub}2Cu{sub}2RuO{sub}8 and Gd{sub}(2-z)Ce{sub}zSr{sub}2Cu{sub}2RuO{sub}10, that begin superconducting at nearly the Sr{sub}2YRuO{sub}6 temperature, which suggests that all of these materials supercon-duct not in their cuprate planes (which do not exist in Sr{sub}2YRuO{sub}6 or Ba{sub}2YRuO{sub}6), but in their SrO layers (BaO layers for Ba{sub}2YRuO{sub}6). Generalization of this result to all high-T{sub}c superconductors implies that the cuprate planes do not superconduct, and that the SrO layers (or equivalent layers) do.
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