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Superconductivity in non-centrosymmetric ThCoC2

  • Author(s): Grant, T
  • Machado, AJS
  • Kim, DJ
  • Fisk, Z
  • et al.

Superconductivity in compounds whose crystal structure lacks inversion symmetry are known to display intriguing properties that deviate from conventional BCS superconducting behavior. Here we report magnetization, resistivity, and heat capacity measurements on polycrystalline samples of ThCoC , which has been reported to crystallize in the non-centrosymmetric CeNiC prototype structure, and show clear evidence of bulk superconductivity in ThCoC with a critical temperature of T = 2.65 K. From the specific heat data we find a Sommerfeld coefficient of γ = 8.38 mJ mol K and a Debye temperature of Θ = 449 K. Interestingly the H superconducting phase diagram displays positive curvature, and the specific heat at low temperature deviates from conventional exponential temperature dependence, which is suggestive of possible unconventional superconducting behavior in ThCoC , similar to that seen in the isostructural and isoelectronic non-centrosymmetric superconductor LaNiC . © 2014 IOP Publishing Ltd. 2 2 2 c D c2 2 2 -1 -2

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