title: Anomalous transport properties and phase diagram of the FeAs-based SmFeAsO1-xFx superconductors.
abstract: We report the detailed phase diagram and anomalous transport properties of Fe-based high-T_{c} superconductors SmFeAsO1-xFx. It is found that superconductivity emerges at x approximately 0.07, and optimal doping takes place in the x approximately 0.20 sample with the highest T_{c} approximately 54 K. T_{c} increases monotonically with doping; the anomaly in resistivity from structural phase or spin-density-wave order is rapidly suppressed, suggesting a quantum critical point around x approximately 0.14. As manifestations, a linear temperature dependence of the resistivity shows up at high temperatures in the x<0.14 regime but at low temperatures just above T_{c} in the x>0.14 regime; a drop in carrier density evidenced by a pronounced rise in the Hall coefficient is observed below the temperature of the anomaly peak in resistivity. A scaling behavior is observed between the Hall angle and temperature: cottheta_{H} proportional, variantT;{1.5} for all samples with different x in SmFeAsO1-xFx system.
authors.affiliation: Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
authors.forename: R H
authors.initials: RH
authors.lastname: Liu
authors.forename: G
authors.initials: G
authors.lastname: Wu
authors.forename: T
authors.initials: T
authors.lastname: Wu
authors.forename: D F
authors.initials: DF
authors.lastname: Fang
authors.forename: H
authors.initials: H
authors.lastname: Chen
authors.forename: S Y
authors.initials: SY
authors.lastname: Li
authors.forename: K
authors.initials: K
authors.lastname: Liu
authors.forename: Y L
authors.initials: YL
authors.lastname: Xie
authors.forename: X F
authors.initials: XF
authors.lastname: Wang
authors.forename: R L
authors.initials: RL
authors.lastname: Yang
authors.forename: L
authors.initials: L
authors.lastname: Ding
authors.forename: C
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authors.lastname: He
authors.forename: D L
authors.initials: DL
authors.lastname: Feng
authors.forename: X H
authors.initials: XH
authors.lastname: Chen