Unified description of superconducting pairing symmetry in electron-doped Fe-based-122 compounds
Bo Li, Lihua Pan, Yuan-Yen Tai, Matthias J. Graf, Jian-Xin Zhu, Kevin E. Bassler, C. S. Ting
DOI 10.1103/PhysRevB.91.220509 · Physical Review B
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Abstract
The pairing symmetry is examined in highly electron-doped Ba(Fe1−xCoxAs)2 and AyFe2Se2 (with A=K, Cs) compounds, with similar crystallographic and electronic band structures. Starting from a phenomenological two-orbital model, we consider nearest-neighbor and next-nearest-neighbor intraorbital pairing interactions on the Fe square lattice. In this model, we find a unified description of the evolution from s±-wave pairing (2.0<n≲2.4) to d-wave pairing (2.4≲n≲2.5) as a function of electron filling. In the crossover region, a time-reversal symmetry breaking s±+id pairing state emerges. This minimal model offers an overall picture of the evolution of superconductivity with electron doping for both s±-wave and d-wave pairings, as long as the dopants only play the role of a charge reservoir. However, the situation is more complicated for Ba(Fe1−xCoxAs)2. A real-space study further shows that when the impurity scattering effects of Co dopants are taken into account, the superconductivity is completely suppressed for n>2.4. This preempts any observation of d-wave pairing in this compound, in contrast to AyFe2Se2 with 0.8<y<1.0.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba(Fe1-xCoxAs)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| AyFe2Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 31 | Pressure not reported | onset |
| RbyFe2Se2 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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