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キーワード:
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要旨:
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.
