Multiband s± Eliashberg theory and temperature-dependent spin-resonance energy in iron pnictide superconductors
G. A. Ummarino
DOI 10.1103/PhysRevB.83.092508 · Physical Review B
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Abstract
The phenomenology of iron pnictide superconductors can be explained in the framework of a three-band s± wave Eliashberg theory with only two free parameters plus a feedback effect, i.e., the effect of the condensate on the antiferromagnetic spin fluctuations responsible for the superconductivity in these compounds. I have examined the experimental data of four materials, LaFeAsO1−xFx, SmFeAsO1−xFx, Ba1−xKxFe2As2, and Ba(FexCo1−x)2As2, and I have found that it is possible to reproduce the experimental critical temperature and gap values in a moderate strong-coupling regime, λtot≈1.7−2.0.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFeAsO0.9F0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28.6 | Pressure not reported | unknown |
| Ba0.6K0.4Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37 | Pressure not reported | unknown |
| SmFeAsO0.8F0.2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 53 | Pressure not reported | unknown |
| Ba(FexCo1-x)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24.5 | Pressure not reported | unknown |
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