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Specific heat has been measured down to 600 mK and up to 8 Tesla by thehighly sensitive AC microcalorimetry on the MgCNi3 single crystals with Tc ~ 7K. Exponential decay of the electronic specific heat at low temperatures provedthat a superconducting energy gap is fully open on the whole Fermi surface, inagreement with our previous magnetic penetration depth measurements on the samecrystals. The specific-heat data analysis shows consistently the strongcoupling strength 2D/kTc ~ 4. This scenario is supported by the direct gapmeasurements via the point-contact spectroscopy. Moreover, the spectroscopymeasurements show a decrease in the critical temperature at the sample surfaceaccounting for the observed differences of the superfluid density deduced fromthe measurements by different techniques.

Superconducting energy gap in MgCNi3 single crystals: Point-contact spectroscopy and specific-heat measurements