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Phonons and electron-phonon coupling in YNi2B2C

TitlePhonons and electron-phonon coupling in YNi2B2C
Publication TypeJournal Article
Year of Publication2014
AuthorsWeber, F, Pintschovius, L, Reichardt, W, Heid, R, Bohnen, KP, Kreyssig, A, Reznik, D, Hradil, K
JournalPhysical Review B
Date Published03
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000332453700005
Keywords(yni2b2c)-b-11, anomalies, borocarbides, inelastic neutron-scattering, linewidths, mixed-basis approach, nb, norm-conserving pseudopotentials, superconducting luni2b2c, t-c

We present a combined density functional perturbation theory and inelastic neutron scattering study of the lattice dynamical properties of YNi2B2C. 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.

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