期刊
SCIENCE
卷 319, 期 5869, 页码 1509-1512出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1154115
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The momentum and temperature dependence of the lifetimes of acoustic phonons in the elemental superconductors lead and niobium were 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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