Anomalous isotope effect in phonon-dressed iron-based superconductor

Details Anomalous isotope effect in phonon-dressed iron-based superconductor Anomalous isotope effect in phonon-dressed iron-based superconductor

2011-12-19

arxiv.org/abs/1112.4326v3

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, minor typos corrected

Scientific paper

The role of electron-phonon interactions in iron-based superconductor is currently under debate with conflicting experimental reports on the isotope effect. To address this important issue, we employ the renormalization-group method to investigate the competition between electron-electron and electron-phonon interactions in these materials. The renormalization-group analysis shows that the ground state is a phonon-dressed unconventional superconductor: the dominant electronic interactions account for pairing mechanism while electron-phonon interactions are subdominant. Because of the phonon dressing, the isotope effect of the critical temperature can be normal or reversed, depending on whether the retarded intra- or inter-band interactions are altered upon isotope substitutions. The connection between the anomalous isotope effect and the unconventional pairing symmetry is discussed at the end.

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