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• W3100356029 abstract "We report $^{75}$As nuclear magnetic resonance (NMR) / nuclear quadrupole resonance (NQR) and transmission electron microscopy (TEM) studies on LaFeAsO$_{1-x}$F$_{x}$. There are two superconducting domes in this material. The first one appears at 0.03 $leq$ $x$ $leq$ 0.2 with $T_{rm c}$$^{max}$ = 27 K, and the second one at 0.25 $leq$ $x$ $leq$ 0.75 with $T_{rm c}$$^{max}$ = 30 K. By NMR and TEM, we demonstrate that a $C4$-to-$C2$ structural phase transition (SPT) takes place above both domes, with the transition temperature $T_{rm s}$ varying strongly with $x$. In the first dome, the SPT is followed by an antiferromagnetic (AF) transition, but neither AF order nor low-energy spin fluctuations are found in the second dome. In LaFeAsO$_{0.97}$F$_{0.03}$, we find that AF order and superconductivity coexist microscopically via $^{75}$As nuclear spin-lattice relaxation rate (1/$T_1$) measurements. In the coexisting region, 1/$T_1$ decreases at $T_{rm c}$ but becomes to be proportional to $T$ below 0.6$T_{rm c}$, indicating gapless excitations. Therefore, in contrast to the early reports, the obtained phase diagram for $x leq$ 0.2 is quite similar to the doped BaFe$_{2}$As$_{2}$ system. The electrical resistivity in the second dome can be fitted by $rho = {{rho }_{0}}+A{{T}^{n}}$ with $n$ = 1 and a maximal coefficient $A$ at around $x_{opt}$ = 0.5$sim$0.55 where $T_{rm s}$ extrapolates to zero and $T_{rm c}$ is the maximal, which suggest the importance of quantum critical fluctuations associated with the SPT. We have constructed a complete phase diagram of LaFeAsO$_{1-x}$F$_{x}$, which provides insight into the relationship between SPT, antiferromagnetism and superconductivity." @default.
• W3100356029 created "2020-11-23" @default.
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• W3100356029 date "2018-06-22" @default.
• W3100356029 modified "2023-09-25" @default.
• W3100356029 title "Structural phase transition, antiferromagnetism and two superconducting domes in LaFeAsO1-xFx (0 < x ≤ 0.75)" @default.
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• W3100356029 doi "https://doi.org/10.1007/s11433-018-9240-0" @default.
• W3100356029 hasPublicationYear "2018" @default.
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