Coincidence between energy gaps and Kohn anomalies in conventional superconductors
S. Johnston, A. P. Sorini, B. Moritz, T. P. Devereaux, D. J. Scalapino
DOI 10.1103/PhysRevB.84.174523 · Physical Review B
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Abstract
Recently, neutron scattering spin-echo measurements have provided high-resolution data on the temperature dependence of the linewidth Γ(q,T) of acoustic phonons in conventional superconductors Pb and Nb [see P. Aynajian et al., Science 319, 1509 (2008)]. At low temperatures, the merging of the 2Δ(T) structure in the linewidth with a peak associated with a low-lying ℏωqKA Kohn anomaly suggested a coincidence between 2Δ(0) and ℏωqKA in Pb and Nb. Here we carry out a standard BCS calculation of the phonon linewidth to examine its temperature evolution and explore how close 2Δ(0)/ℏωqKA must be to unity in order to be consistent with the neutron data.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.2 | Pressure not reported | unknown |
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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