Phonon-self-energy effects due to an electronic mechanism in high-Tc superconductors

E. J. Nicol; J. P. Carbotte

doi:10.1103/PhysRevB.47.8205

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Phonon-self-energy effects due to an electronic mechanism in high-Tc superconductors

E. J. Nicol, J. P. Carbotte

DOI 10.1103/PhysRevB.47.8205 · Physical Review B

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Abstract

The phonon self-energy at q=0 and zero temperature is calculated for a conventional electron-phonon superconductor, Pb, and for an equivalent high-Tc superconductor, assuming an electronic mechanism for the superconductivity (to be specific and as a convenient illustrative example, we use the marginal-Fermi-liquid phenomenology). Comparison between the results demonstrates that for an s-wave strong-coupling superconductor, phonon shifts and widths exhibit the same behavior regardless of the mechanism for superconductivity. In addition, the marginal-Fermi-liquid model shows no unusual behavior at zero temperature in the phonon self-energy, with the exception of a possible narrowing of the phonon width below 2Δ0 in the clean limit. As an aside, we also present renormalized BCS formulas that agree well with the full numerical strong-coupling calculations and could be easily implemented for use in model fits.

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.	—	Pressure not reported	unknown