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Title: Origin of superconductivity in layered centrosymmetric LaNiGa{sub 2}

We have examined the origin of superconductivity in layered centrosymmetric LaNiGa{sub 2} 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{sub 3g} phonon branch resulting from vibrations of these atoms along the Γ-Z symmetry line in the Brillouin zone.
Authors:
 [1] ;  [2]
  1. Sakarya Üniversitesi, Fen-Edebiyat Fakültesi, Fizik Bölümü, 54187 Adapazarı (Turkey)
  2. School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL (United Kingdom)
Publication Date:
OSTI Identifier:
22275692
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BRILLOUIN ZONES; CRITICAL TEMPERATURE; DENSITY FUNCTIONAL METHOD; ELECTRON-PHONON COUPLING; GALLIUM; LANTHANUM; NICKEL; SUPERCONDUCTIVITY; SUPERCONDUCTORS; TEMPERATURE RANGE 0000-0013 K