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Title: Phonon anomalies and superconductivity in the Heusler compound YPd₂Sn

We have studied the structural and electronic properties of YPd₂Sn in the Heusler structure using a generalized gradient approximation of the density functional theory and the ab initio pseudopotential method. The electronic results indicate that the density of states at the Fermi level is primarily derived from Pd d states, which hybridize with Y d and Sn p states. Using our structural and electronic results, phonons and electron-phonon interactions have been studied by employing a linear response approach based on the density functional theory. Phonon anomalies have been observed for transverse acoustic branches along the [110] direction. This anomalous dispersion is merely a consequence of the strong coupling. By integrating the Eliashberg spectral function, the average electron-phonon coupling parameter is found to be λ=0.99. Using this value, the superconducting critical temperature is calculated to be 4.12 K, in good accordance with the recent experimental value of 4.7 K.
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:
22306248
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; D STATES; DENSITY FUNCTIONAL METHOD; DISPERSIONS; ELECTRON-PHONON COUPLING; FERMI LEVEL; HEUSLER ALLOYS; P STATES; PALLADIUM COMPOUNDS; PHONONS; SPECTRAL FUNCTIONS; STRONG-COUPLING MODEL; SUPERCONDUCTIVITY; TEMPERATURE RANGE 0000-0013 K; TIN COMPOUNDS; TRANSITION TEMPERATURE; YTTRIUM COMPOUNDS