Phonon Anomalies Induced by Superconductivity
Hae-Young Kee, C. M. Varma
DOI 10.1103/PhysRevLett.79.4250 · Physical Review Letters
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Abstract
We calculate the electronic polarizability of the superconducting state near extremum vectors Q→0 of the Fermi surface. A pole appears in the polarizability at frequencies ω near the superconducting gap 2Δ which leads to a sharp peak in the spectral function for the lattice vibrations near Q→0 at ω just below 2Δ. A second order transition to a charge density wave state below the superconducting transition is shown to be unlikely. The results are compared with the recent inelastic neutron scattering measurements in compounds, ANi2B2C, A=Y or Lu.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LuNi2B2C 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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