Journal
APPLIED PHYSICS LETTERS
Volume 104, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4862329
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We have examined the origin of superconductivity in layered centrosymmetric LaNiGa2 by employing a linear response approach based on the density functional perturbation theory. Our results indicate that this material is a conventional electron-phonon superconductor with intermediate level of coupling strength, with the electron-phonon coupling parameter of 0.70, and the superconducting critical temperature of 1.90 K in excellent accordance with experimental value of 1.97 K. The largest contribution to the electron-phonon coupling comes from the La d and Ga p electrons near the Fermi energy and the B-3g phonon branch resulting from vibrations of these atoms along the Gamma-Z symmetry line in the Brillouin zone. (C) 2014 AIP Publishing LLC.
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