Journal
PHYSICAL REVIEW LETTERS
Volume 94, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.94.217002
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Specific heat has been investigated in a layered nitride superconductor, Li0.12ZrNCl, with T-c=12.7 K. The obtained data have shown a marked dichotomy: The specific heat jump at T-c (Delta C/gamma T-n(c)=1.8) and the superconducting gap ratio (2 Delta/k(B)T(c)=4.6-5.2) have indicated an intermediate to a strong coupling of electrons, while the upper limit of the electron-phonon coupling constant lambda has directly been estimated to be 0.22, which belongs to a weak coupling regime. Furthermore, the rapid increase of gamma as a function of magnetic field suggests that the present material has an anisotropic s wave gap.
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