Short range magnetic order and effective suppression of superconductivity by manganese-doping in LaFe1-xMnxAsO1-yFy

Abstract

We present a study of the structural and physical properties of directly hole doped LaFe1-xMnxAsO (x = 0.0-0.2) and the influence of charge compensation / electron-doping by additional F doping in LaFe0.9Mn0.1AsO1-yFy (y = 0.1-0.5). High quality polycrystalline samples were prepared using a solid state metathesis reaction. The unit cell increases upon Mn doping, but decreases again when additional F is inserted. The semiconducting character of LaFe1-xMnxAsO decreases with additional F doping. Muon spin relaxation (muSR) measurements reveal short range magnetic order in LaFe1-xMnxAsO and a suppression of magnetism by additional electron-doping with fluoride in LaFe0.9Mn0.1AsO1-yFy. Superconductivity remains absent even though the electronic preconditions are fulfilled in electron-doped LaFe0.9Mn0.1AsO1-yFy at x > 0.1, which is suggestive of effective pair breaking by Mn in this system.

16 pages, 6 figures

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• The poisoning effect of Mn in LaFe(1-x)Mn(x)AsO(0.89)F(0.11): unveiling a quantum critical point in the phase diagram of iron-based superconductors
• Impact of local-moment fluctuations on the magnetic degeneracy of iron arsenide superconductors
• Possible unconventional superconductivity in substituted BaFe${}_2$As${}_2$ revealed by magnetic pair-breaking studies
• Impurity effect and suppression to superconductivity in Na(Fe${}_{0.97-x}$Co${}_{0.03}$T${}_x$)As (T=Cu, Mn)
• Role of magnetic dopants in the phase diagram of Sm1111 pnictides: The Mn case
• Fast recovery of the pristine magnetic and structural phases in superconducting LaFeAsO${}_{0.89}$F${}_{0.11}$ by Mn/Fe substitution
• Record high superconducting transition temperature in Ti${}_{1-x}$Mn${}_x$ alloy with rich magnetic element Mn
• Effect of Mn Substitution on Superconductivity in PrFeAs(O,F): Role of Magnetic Impurities