Electron-phonon coupling and superconducting critical temperature of the YIr2Si2 and LaIr2Si2 high-temperature polymorphs from first-principles

David Billington, Simon A C Nickau, Tom Farley, Jack R. Ward, Rosie F. Sperring, Thomas E. Millichamp, David Ernsting, Stephen B. Dugdale

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Ab initio calculations of the electronic structure and lattice-vibrational properties were performed on the superconducting high-temperature polymorphs of YIr2Si2 and LaIr2Si2. The electron-phonon coupling constants ep were found to be 0.61 and 0.56 for YIr2Si2 and LaIr2Si2, respectively. The superconducting critical temperatures estimated from the Allen-Dynes formula agree well with the available experimental data and indicate that the superconductivity in these compounds can be explained by intermediate strength electron-phonon coupling.

Original languageEnglish
Article number044710
Number of pages5
JournalJournal of the Physical Society of Japan
Issue number4
Early online date19 Mar 2014
Publication statusPublished - 15 Apr 2014


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