A new intermetallic compound, the first to be structurally identified in the Cu−Bi binary system, is reported. This compound is accessed by high-pressure reaction of the elements. Its detailed characterization, physical property measurements, and ab initio calculations are described. The commensurate crystal structure of Cu11Bi7is a unique variation of the NiAs structure type. Temperature-dependent electrical resistivity and heat capacity measurements reveal a bulk superconducting transition at Tc=1.36 K. Density functional theory calculations further demonstrate that Cu11Bi7can be stabilized (relative to decomposition into the elements) at high pressure and temperature. These results highlight the ability of high-pressure syntheses to allow for inroads into heretofore-undiscovered intermetallic systems for which no thermodynamically stable binaries are known.
- high-pressure synthesis
ASJC Scopus subject areas
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Clarke, S. M. (Contributor), Walsh, J. P. S. (Contributor), Amsler, M. (Contributor), Malliakas, C. D. (Contributor), Yu, T. (Contributor), Goedecker, S. (Contributor), Wang, Y. (Contributor), Wolverton, C. M. (Contributor) & Freedman, D. E. (Contributor), FIZ Karlsruhe - Leibniz Institute for Information Infrastructure, 2016