Direct observation of the superconducting gap in phonon spectra

Details Direct observation of the superconducting gap in phonon spectra Direct observation of the superconducting gap in phonon spectra

2008-10-28

arxiv.org/abs/0810.5093v1

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.101.237002

We show that the superconducting energy gap $\Delta$ can be directly observed in phonon spectra, as predicted by recent theories. In addition, since each phonon probes the gap on only a small part of the Fermi surface, the gap anisotropy can be studied in detail. Our neutron scattering investigation of the anisotropic conventional superconductor YNi$_2$B$_2$C demonstrates this new application of phonon spectroscopy.

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