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New Superconducting PbSr2CuO5+δ Prepared by a Novel Low-Temperature Synthetic Route Using Molecular Beam Epitaxy

We report the synthesis of a new superconducting cuprate PbSr2CuO5+δ (Tc∼40 K) by a novel low-temperature synthetic route using molecular beam epitaxy. The new superconductor is the first member of the (Pb-12(n-1)n) homologous series, which contains a single PbO layer as the charge reservoir block. Low temperature synthesis by molecular beam epitaxy (MBE) and an appropriate choice of lattice-matched substrates are essential to our discovery of PbSr2CuO5+δ superconductor. This work demonstrates that MBE opens up a novel synthetic route for new cuprates.