Specific heat measurement of the layered nitride superconductor Li(x)ZrNCl |
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Authors: | Taguchi Y Hisakabe M Iwasa Y |
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Affiliation: | Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan. |
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Abstract: | Specific heat has been investigated in a layered nitride superconductor, Li(0.12)ZrNCl, with T(c)=12.7 K. The obtained data have shown a marked dichotomy: The specific heat jump at T(c) (DeltaC/gamma(n)T(c)=1.8) and the superconducting gap ratio (2Delta/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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