科研之友
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摘要
We describe three previously unreported superconductors, BaPb3, Ba0.89Sr0.11Pb3, and Ba0.5Sr0.5Pb3. These three materials, together with SrPb3, form a distinctive isoelectronic family of intermetallic superconductors based on the stacking of Pb planes, with crystal structures that display a hexagonal to cubic perovskite-like progression, as rarely seen in metals. The superconducting transition temperatures (T-c) are similar for all -2.2K for BaPb3, 2.7K for Ba0.89Sr0.11Pb3, and 2.6K for Ba0.5Sr0.5Pb3, and the previously reported T-c of SrPb3, similar to 2K, is confirmed. The materials are moderate coupling superconductors, and calculations show that the electronic densities of states at the Fermi energy are primarily contributed by Pb. The observations suggest that the Pb-stacking variation has only a minor effect on the superconductivity.
- 出版日期2018-7-15
