Origin of superconductivity in layered centrosymmetric LaNiGa2
Applied Physics Letters
American Institute of Physics (AIP)
Copyright (2014) AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing.
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 B3g phonon branch resulting from vibrations of these atoms along the Γ-Z symmetry line in the Brillouin zone. © 2014 AIP Publishing LLC.
The following article appeared in Applied Physics Letters , Vol. 104, 022603 (2014) and may be found at: http://dx.doi.org/10.1063/1.4862329
Vol.104, 022603 (2014)