A family of Pb-based superconductors with variable cubic to hexagonal packing

Tai Kong; Karolina Górnicka; Sylwia Gołąb; Bartlomiej Wiendlocha; Tomasz Klimczuk; Robert J. Cava

doi:10.7566/JPSJ.87.074711

A family of Pb-based superconductors with variable cubic to hexagonal packing

Tai Kong, Karolina Górnicka, Sylwia Gołąb, Bartlomiej Wiendlocha, Tomasz Klimczuk, Robert J. Cava

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7 Scopus citations

Abstract

We describe three previously unreported superconductors, BaPb₃, Ba_0.89Sr_0.11Pb₃, and Ba_0.5Sr_0.5Pb₃. 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 Ba_0.89Sr_0.11-Pb₃, and 2.6K for Ba_0.5Sr_0.5Pb₃, and the previously reported T_c of SrPb₃, ∼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.

Original language	English
Article number	074711
Journal	Journal of the Physical Society of Japan
Volume	87
Issue number	7
DOIs	https://doi.org/10.7566/JPSJ.87.074711
State	Published - 2018
Externally published	Yes

Funding

Acknowledgements This work was supported by the Gordon and Betty Moore EPiQS initiative, grant number GBMF-4412. Research performed at the AGH-UST was supported by the National Science Center (Poland), project No. 2017=26=E=ST3=00119. SG was partly supported by the EU Project POWR.03.02.00-00-I004=16. The research at Gdansk University of Technology was supported by the National Science Center (Poland), project No. 2015=19=B= ST3=03127.

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title = "A family of Pb-based superconductors with variable cubic to hexagonal packing",

abstract = "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 (Tc) are similar for all -2.2K for BaPb3, 2.7K for Ba0.89Sr0.11-Pb3, and 2.6K for Ba0.5Sr0.5Pb3, and the previously reported Tc of SrPb3, ∼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.",

author = "Tai Kong and Karolina G{\'o}rnicka and Sylwia Go{\l}{\c a}b and Bartlomiej Wiendlocha and Tomasz Klimczuk and Cava, \{Robert J.\}",

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T1 - A family of Pb-based superconductors with variable cubic to hexagonal packing

AU - Kong, Tai

AU - Górnicka, Karolina

AU - Gołąb, Sylwia

AU - Wiendlocha, Bartlomiej

AU - Klimczuk, Tomasz

AU - Cava, Robert J.

PY - 2018

Y1 - 2018

N2 - 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 (Tc) are similar for all -2.2K for BaPb3, 2.7K for Ba0.89Sr0.11-Pb3, and 2.6K for Ba0.5Sr0.5Pb3, and the previously reported Tc of SrPb3, ∼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.

AB - 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 (Tc) are similar for all -2.2K for BaPb3, 2.7K for Ba0.89Sr0.11-Pb3, and 2.6K for Ba0.5Sr0.5Pb3, and the previously reported Tc of SrPb3, ∼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.

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JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

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ER -

A family of Pb-based superconductors with variable cubic to hexagonal packing

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