TENCÉ, Sophie; JANSON, Oleg; KRELLNER, Cornelius; ROSNER, Helge; SCHWARZ, Ulrich; STEGLICH, Frank

doi:10.1088/0953-8984/26/39/395701

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TENCÉ, Sophie
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

JANSON, Oleg
Max-Planck-Institut für Chemische Physik fester Stoffe [CPfS]

KRELLNER, Cornelius
Kristall- und Materiallabor Physikalisches Institut

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Journal of Physics: Condensed Matter. 2014, vol. 26, n° 39, p. 395701 (5 p.)

IOP Publishing

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The first compound in the cobalt bismuth system was synthesized by high-pressure high-temperature synthesis at 5 GPa and 450 °C. CoBi3 crystallizes in space group Pnma (no. 62) with lattice parameters of a = 8.8464(7) Å, b = 4.0697(4) Å and c = 11.5604(9) Å adopting a NiBi3-type crystal structure. CoBi3 undergoes a superconducting transition at Tc = 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.< Réduire

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Thermodynamic properties

Pressure effect

Inorganic compounds

Materials

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

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