Isotope effect and the role of phonons in the iron-based superconductors
Yunkyu Bang
DOI 10.1103/PhysRevB.79.092503 · Physical Review B
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Abstract
We studied the isotope effect of phonon in the Fe-based superconductors using a phenomenological two band model for the sign-changing s-wave (±s-wave) state. Within this mean-field model, we showed that the large isotope effect is not inconsistent with the ±s-wave pairing state and its high transition temperature. In principle, a large phonon isotope coefficient α implies a large phonon coupling constant. However, the asymmetric density of states between two bands substantially enhances the value of α, so that a moderate value of the phonon coupling constant (λph≈0.4) can produce a very large value of α(≈0.4) as well as a high transition temperature together with an antiferromagnet-induced interaction.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba1-xKxFe2As2 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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