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Journal Article

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

MPS-Authors
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Kim,  J. S.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Xie,  W. H.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Kremer,  R. K.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Babizhetskyy,  V.
Department Quantum Materials (Hidenori Takagi), Max Planck Institute for Solid State Research, Max Planck Society;
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Department Nanochemistry (Bettina V. Lotsch), Max Planck Institute for Solid State Research, Max Planck Society;

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Jepsen,  O.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Simon,  A.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Ahn,  K. S.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Kim, J. S., Xie, W. H., Kremer, R. K., Babizhetskyy, V., Jepsen, O., Simon, A., et al. (2007). Strong electron-phonon coupling in the rare-earth carbide superconductor La2C3. Physical Review B, 76(1): 014516.


Cite as: https://hdl.handle.net/21.11116/0000-000E-B627-9
Abstract
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 (T-c approximate to 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 be lambda(ph)similar to 1.35. The electron-phonon coupling to low energy phonon modes is found to be the leading mechanism for 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 the strong electron-phonon coupling. Possible effects on the superconducting properties due to the noncentrosymmetry of the crystal structure are discussed.