- PHYSICAL SOC JAPAN
Spatial phase separation into mesoscopic domains of non-magnetic [superconducting (SC) below T-c similar or equal to 25.5 K] and two kinds of magnetic phases, one showing disordered spin density wave (d-SDW) order and another associated with glassy weak magnetism (WM), are observed below similar to 100K by muon spin rotation (mu SR) in LaFeAsO1-xFx for x = 0.057(3), which is near the boundary of these phases on the doping phase diagram. In contrast to the competing order observed in the regular SDW phase of Ba(Fe1-xCox)(2)As-2, the WM domain exhibits cooperative coupling of superconducting and magnetic order parameters as inferred from strong diamagnetism and the associated negative shift of mu SR frequency just below T-c.
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