Model for the inverse isotope effect of FeAs-based superconductors in the π-phase-shifted pairing state
Han-Yong Choi, Jae Hyun Yun, Yunkyu Bang, Hyun C. Lee
DOI 10.1103/PhysRevB.80.052505 · Physical Review B
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Abstract
The isotope effects for Fe-based superconductors are considered by including the phonon and magnetic fluctuations within the two-band Eliashberg theory. We show that the recently observed inverse isotope effects of Fe, αFe≈−0.18±0.03 [P. M. Shirage, K. Kihou, K. Miyazawa, C.-H. Lee, H. Kito, H. Eisaki, Y. Tanaka, and A. Iyo, arXiv:0903.3515 (unpublished)] as well as the large positive isotope exponent (α≈0.35) can naturally arise for the magnetically induced sign revered s-wave pairing state within reasonable parameter range. Either experimental report cannot be discarded from the present analysis based on the parameter values they require. The inverse and positive isotope effects mean, respectively, the interband and intraband dominant electron-phonon interactions. We first make our points based on the analytic result from the square-well potential model and present explicit numerical calculations of the two-band Eliashberg theory.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SmFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| 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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