Zn-impurity effect and interplay of s± and s++ pairings in iron-based superconductors
Zi-Jian Yao, Wei-Qiang Chen, Yu-ke Li, Guang-han Cao, Hong-Min Jiang, Qian-En Wang, Zhu-an Xu, Fu-Chun Zhang
DOI 10.1103/PhysRevB.86.184515 · Physical Review B
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Abstract
We report theoretical and experimental studies of the effect of Zn impurity in Fe-based superconductors. Zn impurity is expected to severely suppress sign reversed s±-wave pairing. The experimentally observed suppression of Tc under Zn doping strongly depends on the materials and the charge-carrier contents, which suggests competition of s++ and s± pairings in Fe-based superconductors. We study a model incorporating both s++- and s±-pairing couplings by using the Bogoliubov de-Gennes equation, and we show that the Zn impurity strongly suppresses s± pairing and may induce a transition from the s± to s++ wave. Our theory is consistent with various experiments on the impurity effect. We present new experimental data on the Zn-doping SmFe1−xZnxAsO0.9F0.1 of Tc= 50 K, in further support of our proposal.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SmFe1-xZnxAsO0.9F0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 50 | Pressure not reported | unknown |
| LaFe1-xZnxAsO1-yFy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| BaFe2(1-x-y)Zn2xCo2yAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| SrFe1.8-2xZn2xCo0.2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LaFeAsO0.9F0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LaFeAsO0.85F0.15 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LaFeAsO0.85 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LaFe1-x-yCoyZnxO 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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