OXIDE SUPERCONDUCTIVITY

摘要

The trio of ruthenate compounds, doped Sr_2YRuO_6, GdSr_2Cu_2RuO_8, and Gd_(2-z)Ce_zSr_2Cu_2RuO_(10) all superconduct in their SrO layers, which is why they have almost the same ≈49 K onset temperatures for superconductivity. The sister compound Ba_2GdRuO_6, whether doped or not, does not superconduct, because the Gd breaks Cooper pairs. These fit in with the superconducting cuprates: the superconducting layers are SrO or BaO, not CuO_2.