Short-range magnetic order and effective suppression of superconductivity by manganese doping in LaFe1−xMnxAsO1−yFy
Rainer Frankovsky, Hubertus Luetkens, Frank Tambornino, Alexey Marchuk, Gwendolyne Pascua, Alex Amato, Hans-Henning Klauss, Dirk Johrendt
DOI 10.1103/PhysRevB.87.174515 · Physical Review B
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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 by additional F doping in LaFe0.9Mn0.1AsO1−yFy (y=0.1−0.5). High-quality polycrystalline samples were prepared for Mn-doped LaFe1−xMnxAsO and the low doping regime in LaFe0.9Mn0.1AsO1−yFy (y = 0.1 and 0.2) 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 (μSR) 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFe1-xMnxAsO1-yFy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LaFe0.9Mn0.1AsO1-yFy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LaFeAsO0.9F0.1 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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