Physics – Condensed Matter – Superconductivity
Scientific paper
2006-06-30
Phys. Rev. Lett. 96, 225501 (2006)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1103/PhysRevLett.96.225501
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.
Aynajian Pegor
Boeri Lilia
Bose Saurabh K.
Habicht Klaus
Keimer Bernhard
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