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

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.

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 Creators:
Kim, J. S.1, Author           
Xie, W. H.2, Author           
Kremer, R. K.1, Author           
Babizhetskyy, V.2, 3, 4, Author           
Jepsen, O.2, Author           
Simon, A.2, Author           
Ahn, K. S.1, Author           
Raquet, B., Author
Rakoto, H., Author
Broto, J. M., Author
Ouladdiaf, B., Author
Affiliations:
1Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society, ou_3370501              
2Former Departments, Max Planck Institute for Solid State Research, Max Planck Society, ou_3370502              
3Department Quantum Materials (Hidenori Takagi), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370487              
4Department Nanochemistry (Bettina V. Lotsch), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370482              

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 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.

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Language(s): eng - English
 Dates: 2007
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 338721
ISI: 000248487900114
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Title: Physical Review B
Source Genre: Journal
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Pages: - Volume / Issue: 76 (1) Sequence Number: 014516 Start / End Page: - Identifier: ISSN: 1098-0121