Impact of concomitant Y and Mn substitution on superconductivity in La1−yYyFe1−xMnxAsO0.89F0.11
Rhea Kappenberger, Franziska Hammerath, Pierre Rousse, Mesfin Asfaw Afrassa, M. Hossein Haghighi, Sirko Kamusella, Giacomo Prando, Gianrico Lamura, Anja U. B. Wolter, Matteo Moroni, Samuele Sanna, Pietro Carretta, Christian Hess, Hans-Joachim Grafe, Hans-Henning Klauss, Sabine Wurmehl, Bernd Büchner
DOI 10.1103/PhysRevB.97.054522 · Physical Review B
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Abstract
We discuss the impact of concomitant substitution of Fe by Mn and La by Y in optimally F-doped LaFeAsO0.89F0.11. Mn has a known poisoning effect on superconductivity which is particularly strong in the La1111 system, where 0.2% of Mn were reported to completely suppress superconductivity. Through isovalent substitution of La by the much smaller Y we are able to inflict chemical pressure on the structure, which we show is stabilizing the superconducting state, resulting in a drastically larger amount of Mn needed to completely quench superconductivity. Interestingly, we find that the lattice parameter c changes significantly even for small amounts of Mn substitution within a series, which is unexpected taking only the differences between ionic radii into account. We discuss our findings in the light of electron localization caused by small amounts of paramagnetic Mn impurities in La1−yYyFe1−xMnxAsO0.89F0.11 also indicated by resistivity and Mößbauer measurements.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1-yYyFe1-xMnxAsO0.89F0.11 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LaFeAsO0.89F0.11 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LaFeAs(O,F) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 43 | Pressure not reported | unknown |
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