Superconductivity-Induced Distortions of Phonon Lineshapes in Niobium

Abstract

Superconductivity-induced changes of phonon lineshapes in niobium have been re-investigated by high-resolution inelastic neutron scattering. We show that the changes go beyond a simple change in lifetime and frequency when the phonon frequency is close to the superconducting energy gap $2\Delta$. The observed lineshapes in elemental niobium are qualitatively similar to those found previously in borocarbide superconductors and agree very well with those predicted by the theory of Allen et al. [PRB 56, 5552 (1997)]. Our results indicate that the peculiar phonon lineshapes in the superconducting state predicted by the theory of Allen et al. are a general phenomenon and not restricted to a particular class of compounds.

in print with Physical Review B

References in corpus (1)

• Energy Gaps and Kohn Anomalies in Elemental Superconductors

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• Electron-phonon coupling and superconductivity-induced distortion of the phonon lineshape in V${}_3$Si
• Electron-momentum dependence of electron-phonon coupling underlies dramatic phonon renormalization in YNi${}_2$B${}_2$C