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The low temperature specific heat of the superconductor MgCNi$_3$ and anon-superconductor MgC$_{0.85}$Ni$_3$ is investigated in detail. An additionalcontribution is observed from the data of MgCNi$_3$ but absent inMgC$_{0.85}$Ni$_3$, which is demonstrated to be insensitive to the appliedmagnetic field even up to 12 Tesla. A detailed discussion on its origin is thenpresented. By subtracting this additional contribution, the zero field specificheat of MgCNi$_3$ can be well described by the BCS theory with the gap ratio($\Delta/k_BT_c$) determined by the previous tunneling measurements. Theconventional s-wave pairing state is further proved by the magnetic fielddependence of the specific heat at low temperatures and the behavior of theupper critical field.Comment: To appear in Physical Review B, 6 pages, 7 figure

physical review. b, condensed matter and materials physics

Competition between BCS superconductivity and ferromagnetic spin fluctuations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Mg</mml:mi><mml:mi mathvariant="normal">C</mml:mi><mml:msub><mml:mi mathvariant="normal">Ni</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Competition between BCS superconductivity and ferromagnetic spin fluctuations inMgCNi3