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Issue 38, 2014
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BaC: a thermodynamically stable layered superconductor

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To predict all stable compounds in the Ba–C system, we perform a comprehensive study using first-principles variable-composition evolutionary algorithm USPEX. We find that at 0 K the well-known compound BaC2 is metastable in the whole pressure range 0–40 GPa, while intercalated graphite phase BaC6 is stable at 0–19 GPa. A hitherto unknown layered orthorhombic Pbam phase of BaC has structure consisting of alternating layers of Ba atoms and layers of stoichiometry Ba2C3 containing linear C3 groups and is predicted to be stable in the pressure range 3–32 GPa. From our electron–phonon coupling calculations, the newly found BaC compound is a phonon-mediated superconductor and has a critical superconductivity temperature Tc of 4.32 K at 5 GPa. This compound is dynamically stable at 0 GPa and therefore may be quenchable under normal conditions.

Graphical abstract: BaC: a thermodynamically stable layered superconductor

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Publication details

The article was received on 25 Jun 2014, accepted on 15 Aug 2014 and first published on 18 Aug 2014

Article type: Paper
DOI: 10.1039/C4CP02781G
Phys. Chem. Chem. Phys., 2014,16, 20780-20784

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    BaC: a thermodynamically stable layered superconductor

    D. Wang, H. Zhou, C. Hu, A. R. Oganov, Y. Zhong and G. Rao, Phys. Chem. Chem. Phys., 2014, 16, 20780
    DOI: 10.1039/C4CP02781G

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