Superconductivity at 43 K at ambient pressure in the iron-based layered compound La1−xYxFeAsOy
Parasharam M. Shirage, Kiichi Miyazawa, Hijiri Kito, Hiroshi Eisaki, Akira Iyo
DOI 10.1103/PhysRevB.78.172503 · Physical Review B
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Abstract
Effect of Y substitution on the La-based iron oxypnictide superconductor LaFeAsO0.6 is studied. Replacement of La3+ (1.16 Å) by smaller Y3+ (1.019 Å) in a form of La1−xYxFeAsO0.6 results in the decrease in lattice parameters, which likely causes pressure effect into the system. Superconducting transition temperature (Tc) increases monotonically with x, eventually up to 43.1 K for x=0.5. This Tc is comparable to the highest Tc reported for Y-free F-doped LaFeAsO1−xFx under high pressure. The present results provide an alternative and much simpler way to achieve higher Tc in the La-based oxypnictide superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1-xYxFeAsO0.6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 43.1 | Pressure unresolved | onset |
| La1-xYxFeAsO0.6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 43.1 | Pressure unresolved | onset |
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 43 | 4 GPa | unknown |
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