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

T. Keller·P. Aynajian·K. Habicht·L. Boeri·S. K. Bose·B. Keimer
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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 $\sim 6 μ$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.

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T. Keller, P. Aynajian, K. Habicht, L. Boeri, S. K. Bose, B. Keimer. 2006-06-30. Momentum-resolved electron-phonon interaction in lead determined by neutron resonance spin-echo spectroscopy. https://doi.org/10.1103/physrevlett.96.225501

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