Impact of concomitant Y and Mn substitution on superconductivity in La1−yYyFe1−xMnxAsO0.89F0.11
| Autor: | Hans-Henning Klauss, F. Hammerath, Sabine Wurmehl, M. Moroni, Christian Hess, G. Lamura, S. Sanna, Pietro Carretta, Rhea Kappenberger, Bernd Büchner, Giacomo Prando, Hans-Joachim Grafe, Anja U. B. Wolter, Mesfin Asfaw Afrassa, Sirko Kamusella, Pierre Rousse, M. Hossein Haghighi |
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| Rok vydání: | 2018 |
| Předmět: |
Superconductivity
Materials science Ionic radius 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Electron localization function Paramagnetism Crystallography Lattice constant Impurity Electrical resistivity and conductivity Y Y Y 0103 physical sciences 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review B. 97 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | We discuss the impact of concomitant substitution of Fe by Mn and La by Y in optimally F-doped ${\mathrm{LaFeAsO}}_{0.89}{\mathrm{F}}_{0.11}$. 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 $\mathit{c}$ 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 ${\mathrm{La}}_{1\ensuremath{-}y}{\mathrm{Y}}_{y}{\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}{\mathrm{AsO}}_{0.89}{\mathrm{F}}_{0.11}$ also indicated by resistivity and M\"o\ss{}bauer measurements. |
| Databáze: | OpenAIRE |
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