Is LaFeAsO1−xFx an Electron-Phonon Superconductor?
L. Boeri, O. V. Dolgov, A. A. Golubov
DOI 10.1103/PhysRevLett.101.026403 · Physical Review Letters
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Abstract
In this Letter, we calculate the electron-phonon coupling of the newly discovered superconductor LaFeAsO1−xFx using linear response. For pure LaFeAsO, the calculated electron-phonon coupling constant λ=0.21 and logarithmic-averaged frequency ωln=206 K give a maximum Tc of 0.8 K, using the standard Migdal-Eliashberg theory. For the F-doped compounds, we predict even smaller coupling constants. To reproduce the experimental Tc, a 5–6 times larger coupling constant would be needed. Our results indicate that electron-phonon coupling is not sufficient to explain superconductivity in the whole family of Fe-As-based superconductors, probably due to the importance of strong-correlation effects.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.8 | Pressure not reported | unknown |
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
| LaFePO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | unknown |
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