Energy Gaps and Kohn Anomalies in Elemental Superconductors

Details Energy Gaps and Kohn Anomalies in Elemental Superconductors Energy Gaps and Kohn Anomalies in Elemental Superconductors

2008-08-07

arxiv.org/abs/0808.1028v1

Science 319, 1509 (2008)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1126/science.1154115

The momentum and temperature dependence of the lifetimes of acoustic phonons in the elemental superconductors Pb and Nb was determined by resonant spin-echo spectroscopy with neutrons. In both elements, the superconducting energy gap extracted from these measurements was found to converge with sharp anomalies originating from Fermi-surface nesting (Kohn anomalies) at low temperatures. The results indicate electron many-body correlations beyond the standard theoretical framework for conventional superconductivity. A possible mechanism is the interplay between superconductivity and spin- or charge-density-wave fluctuations, which may induce dynamical nesting of the Fermi surface.

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