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 Tc over an extended range of the Brillouin zone. For phonons with energies below the superconducting energy gap, a linewidth reduction of maximum amplitude ∼6μeV was observed below Tc. The electron-phonon contribution to the phonon lifetime extracted from these data is in satisfactory overall agreement with ab initio lattice-dynamical calculations, but significant deviations are found.
- Publication:
-
Physical Review Letters
- Pub Date:
- June 2006
- DOI:
- 10.1103/PhysRevLett.96.225501
- arXiv:
- arXiv:cond-mat/0606816
- Bibcode:
- 2006PhRvL..96v5501K
- Keywords:
-
- 63.20.Kr;
- 61.12.Ex;
- 74.25.Kc;
- 74.70.Ad;
- Phonon-electron and phonon-phonon interactions;
- Neutron scattering;
- Phonons;
- Metals;
- alloys and binary compounds;
- Condensed Matter - Superconductivity;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- Phys. Rev. Lett. 96, 225501 (2006)