Momentum-resolved electron-phonon interaction in lead determined by neutron resonance spin-echo spectroscopy

Abstract

Neutron resonance spin-echo spectroscopy was used to monitor the temperature evolution of the linewidths of transverse acoustic phonons in lead across the superconducting transition temperature, $T_c$, over an extended range of the Brillouin zone. For phonons with energies below the superconducting energy gap, a linewidth reduction of maximum amplitude $\sim 6\mu$eV was observed below $T_c$. The electron-phonon contribution to the phonon lifetime extracted from these data is in satisfactory overall agreement with {\it ab-initio} lattice-dynamical calculations, but significant deviations are found.

References in corpus (6)

• Phonons and related properties of extended systems from density-functional perturbation theory
• Thermal Contraction and Disordering of the Al(110) Surface
• Linear-response theory and lattice dynamics: a muffin-tin orbital approach
• Electron-phonon interaction in the normal and superconducting states of MgB2
• Electron-phonon interactions and related physical properties of metals from linear-response theory
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• Electron-phonon coupling and superconductivity-induced distortion of the phonon lineshape in V${}_3$Si
• Transverse acoustic phonon anomalies at intermediate wavevectors in MgV${}_2$O${}_4$