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Cooperative order in the weakly magnetic domain of LaFeAsO$_{1-x}$F$_{x}$ near the doping phase boundary

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arxiv 1401.7780 v1 pith:U6W6G7XB submitted 2014-01-30 cond-mat.str-el

M. Hiraishi , R. Kadono , M. Miyazaki , I. Yamauchi , A. Koda , K. M. Kojima , M. Ishikado , S. Wakimoto
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S. Shamoto
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classification cond-mat.str-el
keywords orderphasebelowmagneticassociatedboundarycooperativedomain
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Spatial phase separation into mesoscopic domains of non-magnetic [superconducting (SC) below Tc = 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 ~100 K by muon spin rotation (muSR) 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)2As2, the WM domain exhibits cooperative coupling of superconducting and magnetic order parameters as inferred from strong diamagnetism and associated negative shift of muSR frequency just below Tc.

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