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Title: Phonons and electron-phonon coupling in YNi 2B 2C

We present a combined density functional perturbation theory and inelastic neutron scattering study of the lattice dynamical properties of YNi 2B 2C. In general, very good agreement was found between theory and experiment for both phonon energies and line widths. Our analysis reveals that the strong coupling of certain low energy modes is linked to the presence of large displacements of the light atoms, i.e., B and C, which is unusual in view of the rather low phonon energies. Specific modes exhibiting a strong coupling to the electronic quasiparticles were investigated as a function of temperature. Their energies and line widths showed marked changes on cooling from room temperature to just above the superconducting transition at T c = 15.2 K. Calculations simulating the effects of temperature allow us to model the observed temperature dependence qualitatively.
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4]
  1. Karlsruhe Inst. for Technology (Germany)
  2. Dresden Univ. of Technology (Germany); Ames Lab., Ames, IA (United States)
  3. CEA Saclay (France); Univ. of Colorado, Boulder, CO (United States)
  4. Univ. of Gottingen (Germany)
Publication Date:
OSTI Identifier:
Report Number(s):
IS-J 8271
Journal ID: ISSN 2469-9950
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B; Journal Volume: 89; Journal Issue: 10
American Physical Society (APS)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States