Superconductivity at 33–37 K in ALn2Fe4As4O2 (A=Kand Cs;Ln=lanthanides)
Si-Qi Wu, Zhi-Cheng Wang, Chao-Yang He, Zhang-Tu Tang, Yi Liu, Guang-Han Cao
DOI 10.1103/PhysRevMaterials.1.044804 · Physical Review Materials
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Abstract
We have synthesized ten iron oxyarsenides, KLn2Fe4As4O2 (Ln=Gd,Tb,Dy,and Ho) and CsLn2Fe4As4O2 (Ln=Nd,Sm,Gd,Tb,Dy,and Ho), with the aid of the lattice-match approach. The resultant compounds possess hole-doped conducting double FeAs layers [AFe4As4]2− that are separated by the insulating [Ln2O2]2+ slabs. Measurements of electrical resistivity and dc magnetic susceptibility demonstrate bulk superconductivity at Tc=33–37 K. We find that Tc correlates with the axial ratio c/a for all 12442-type superconductors discovered. Also, Tc tends to increase with the lattice mismatch, implying that lattice instability plays a role in the enhancement of superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| KGd2Fe4As4O2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37.1 | Pressure not reported | onset |
| KTb2Fe4As4O2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 36 | Pressure not reported | onset |
| KDy2Fe4As4O2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 36 | Pressure not reported | onset |
| KHo2Fe4As4O2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 36 | Pressure not reported | onset |
| CsNd2Fe4As4O2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32.9 | Pressure not reported | onset |
| CsSm2Fe4As4O2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35.4 | Pressure not reported | onset |
| CsGd2Fe4As4O2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35.4 | Pressure not reported | onset |
| CsTb2Fe4As4O2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35.4 | Pressure not reported | onset |
| CsDy2Fe4As4O2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35.4 | Pressure not reported | onset |
| CsHo2Fe4As4O2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35.4 | Pressure not reported | onset |
| KCa2Fe4As4F2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 33 | Pressure not reported | unknown |
| RbCa2Fe4As4F2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30.5 | Pressure not reported | unknown |
| CsCa2Fe4As4F2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28.2 | Pressure not reported | unknown |
| RbGd2Fe4As4O2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | unknown |
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