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6 September 2000 New superconducting lead cuprates prepared by molecular beam epitaxy
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In this article we describe the synthesis of a new superconducting lead cuprate PbSr2CuO5+(delta )(Tc approximately 40 K) by molecular beam epitaxy (MBE). The new superconductor is the first member of the Pb-12(n-1)n homologous series, which contain a single PbO layer as the charge reservoir block. This material is a thermodynamically quasi-stable phase, and has not been synthesized in bulk. Low-temperature synthesis by MBE and an appropriate choice of substrates were essential to our discovery of the PbSr2CuO5+(delta ) superconductor. This work demonstrates that MBE offers a novel synthetic route in the material search for new superconducting cuprates. Furthermore, we are attempting to synthesize higher n members of the Pb-12(n-1)n homologous series, but have encountered limited success partly because the volatility of Pb and PbOx limits the growth temperature.
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Michio Naito, Shin-ichi Karimoto, and Hideki Yamamoto "New superconducting lead cuprates prepared by molecular beam epitaxy", Proc. SPIE 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV, (6 September 2000);

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