Competing effects of Mn and Y doping on the low-energy excitations and phase diagram of La1−yYyFe1−xMnxAsO0.89F0.11 iron-based superconductors
M. Moroni, S. Sanna, G. Lamura, T. Shiroka, R. De Renzi, R. Kappenberger, M. A. Afrassa, S. Wurmehl, A. U. B. Wolter, B. Büchner, P. Carretta
DOI 10.1103/PhysRevB.94.054508 · Physical Review B
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Abstract
Muon spin rotation (μSR) and F19 nuclear magnetic resonance (NMR) measurements were performed to investigate the effect of Mn for Fe substitutions in La1−yYyFe1−xMnxAsO0.89F0.11 superconductors. While for y=0 a very low critical concentration of Mn (x=0.2%) is needed to quench superconductivity, as y increases the negative chemical pressure introduced by Y for La substitution stabilizes superconductivity and for y=20% it is suppressed at Mn contents an order of magnitude larger. A magnetic phase arises once superconductivity is suppressed both for y=0 and for y=20%. Low-energy spin fluctuations give rise to a peak in F19 NMR 1/T1 with an onset well above the superconducting transition temperature and whose magnitude increases with x. Also the static magnetic correlations probed by F19 NMR linewidth measurements show a marked increase with Mn content. The disruption of superconductivity and the onset of the magnetic ground state are discussed in the light of the proximity of LaFeAsO0.89F0.11 to a quantum critical point.
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 |
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