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CoBi3-the first binary compound of cobalt with bismuth: high-pressure synthesis and superconductivity

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Rosner,  H.
Helge Rosner, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Schwarz,  U.
Ulrich Schwarz, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Grin,  Y.
Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Steglich,  F.
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Tence, S., Janson, O., Krellner, C., Rosner, H., Schwarz, U., Grin, Y., et al. (2014). CoBi3-the first binary compound of cobalt with bismuth: high-pressure synthesis and superconductivity. Journal of Physics: Condensed Matter, 26(39): 395701, pp. 1-6. doi:10.1088/0953-8984/26/39/395701.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0024-348D-8
Abstract
The first compound in the cobalt bismuth system was synthesized by high-pressure high-temperature synthesis at 5 GPa and 450 degrees C. CoBi3 crystallizes in space group Pnma (no. 62) with lattice parameters of a = 8.8464(7) angstrom, b = 4.0697(4) angstrom and c = 11.5604(9) angstrom adopting a NiBi3-type crystal structure. CoBi3 undergoes a superconducting transition at T-c = 0.48(3) K as evidenced by electrical-resistivity and specific-heat measurements. Based on the anomaly of the specific heat at Tc and considering the estimated electron-phonon coupling, the new Bi-rich compound can be classified as a Bardeen-Cooper-Schrieffer-type superconductor with weak electron-phonon coupling. Density-functional theory calculations disclose a sizable influence of the spin-orbit coupling to the valence states and proximity to a magnetic instability, which accounts for a significantly enhanced Sommerfeld coefficient.