Physics – Condensed Matter – Superconductivity
Scientific paper
2011-05-05
Phys. Rev. B 83, 104511 (2011)
Physics
Condensed Matter
Superconductivity
Scientific paper
Specific heat has been measured down to 600 mK and up to 8 Tesla by the highly sensitive AC microcalorimetry on the MgCNi3 single crystals with Tc ~ 7 K. Exponential decay of the electronic specific heat at low temperatures proved that a superconducting energy gap is fully open on the whole Fermi surface, in agreement with our previous magnetic penetration depth measurements on the same crystals. The specific-heat data analysis shows consistently the strong coupling strength 2D/kTc ~ 4. This scenario is supported by the direct gap measurements via the point-contact spectroscopy. Moreover, the spectroscopy measurements show a decrease in the critical temperature at the sample surface accounting for the observed differences of the superfluid density deduced from the measurements by different techniques.
Demuer A.
Jang Dong-Jin
Kacmarcik Jozef
Klein Thomas
Lee Ho-Gyu
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