Magnetic and superconducting instabilities in a hybrid model of itinerant/localized electrons for iron pnictides
Yi-Zhuang You, Fan Yang, Su-Peng Kou, Zheng-Yu Weng
DOI 10.1103/PhysRevB.84.054527 · Physical Review B
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Abstract
We study a unified mechanism for spin-density-wave (SDW) and superconductivity in a minimal model in which itinerant electrons and local moments coexist as previously proposed for the iron pnictides [Kou, Li, Weng, EPL 88, 17010 (2009)]. The phase diagram obtained at the mean-field level is in qualitative agreement with the experiment, which shows how the magnetic and superconducting (SC) instabilities are driven by the critical coupling between the itinerant/localized electrons. The spin and charge response functions at the random-phase-approximation level further characterize the dynamical evolution of the system. In particular, the dynamic spin susceptibility displays a Goldstone mode in the SDW phase, which evolves into a gapped resonance-like mode in the SC phase. The latter persists all the way into the normal state above Tc where a strong scattering between the itinerant electrons and local moments is restored, as an essential feature of the model.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeTe0.35Se0.65 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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