Abstract
All the high-T c oxide superconductors (HTSC) known to date are copper-based oxides (cuprates) in the layered perovskite crystal structures that contain a planar network of copper and oxygen (CuO2 planes). Without doubt such a planner network provides the essential environment for the occurrence of high T c. Since these structures are by no means unique to the cuprates, one naively expects the presence of similar superconductors not based on copper. However, no such superconductor was known despite nearly a decade of searching after the discovery of HTSC by Bednorz and Muller [1]. About two years ago we finally discovered [2] the first noncuprate superconductor in the layered-perovskite structure, Sr2RuO4with T c ≈1 K. This ruthenate still appears to be the only example of such a superconductor to date.
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