Strong electron-phonon coupling in the rare-earth carbide superconductor La2C3

Details Strong electron-phonon coupling in the rare-earth carbide superconductor La2C3 Strong electron-phonon coupling in the rare-earth carbide superconductor La2C3

2007-03-11

arxiv.org/abs/cond-mat/0703279v1

Physics

Condensed Matter

Superconductivity

12 pages, 11 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.76.014516

We present the results of a crystal structure determination using neutron powder diffraction as well as the superconducting properties of the rare-earth sesquicarbide La2C3 (Tc ~ 13.4 K) by means of specific heat and upper critical field measurements. From the detailed analysis of the specific heat and a comparison with ab-initio electronic structure calculations, a quantitative estimate of the electron-phonon coupling strength and the logarithmic average phonon frequency is made. The electron-phonon coupling constant is determined to \lambda ~ 1.35. The electron-phonon coupling to low energy phonon modes is found to be the leading mechanism for the superconductivity. Our results suggest that La2C3 is in the strong coupling regime, and the relevant phonon modes are La-related rather than C-C stretching modes. The upper critical field shows a clear enhancement with respect to the Werthamer-Helfand-Hohenberg prediction, consistent with strong electron-phonon coupling. Possible effects on the superconducting properties due to the noncentrosymmetry of the crystal structure are discussed.

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