Measurements of the electron-phonon interaction in Nb by inelastic neutron scattering
- 1 December 1975
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 12 (11), 4899-4908
- https://doi.org/10.1103/physrevb.12.4899
Abstract
Precise linewidth and frequency measurements of transverse acoustic modes propagating along the [001] and [110] directions were performed on single crystals of niobium in the normal and superconducting phases (K). For transverse phonons propagating along the [110] direction changes in linewidth are observed when the superconducting gap equals the phonon frequency. This behavior agrees with Bobetic's calculation for the attenuation of high-frequency sound waves in superconductors and the magnitude of the change enables us to calculate the electron-phonon interactions. In addition to linewidth changes, anomalous temperature dependence of the peak position of some acoustic modes is also observed. The [001] transverse phonons exhibit a decrease of ∼ 15% when is decreased from 300°K to . Below there is an additional softening of 3%. This softening extends along the direction to , the limit of our measurements.
Keywords
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