Linear decrease of critical temperature with increasing Zn substitution in the iron-based superconductor BaFe1.89−2xZn2xCo0.11As2
Jun Li, Yanfeng Guo, Shoubao Zhang, Shan Yu, Yoshihiro Tsujimoto, Hiroshi Kontani, Kazunari Yamaura, Eiji Takayama-Muromachi
DOI 10.1103/PhysRevB.84.020513 · Physical Review B
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Abstract
The nonmagnetic impurity effect is studied on the Fe-based BaFe1.89−2xCo0.11As2 superconductor (Tc = 25 K) with Zn substitution for Fe up to 8 at. %, which is achieved by means of high-pressure and high-temperature heating. Tc decreases almost linearly with increasing Zn content and disappears at ∼8 at. %. It is different in the shared phenomenology of the early Zn doping studies, where Tc decreased little. The decreasing Tc rate, however, remains much lower (3.63 K/%) than what is expected for the s±-wave model, implying the model is inaccurate. Another symmetry model such as the non-sign-reversal s-wave model may better account for the result.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe1.89-2xZn2xCo0.11As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | unknown |
| BaFe1.89-2xZn2xCo0.11As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | midpoint |
| NdFeAsO0.88F0.12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Ba0.5K0.5Fe2As2 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 |
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