Evolution from non-Fermi- to Fermi-liquid transport via isovalent doping in BaFe 2 ( As 1 − x P x ) 2 superconductors

The normal-state charge transport is studied systematically in high-quality single crystals of ${text{BaFe}}_{2}{({text{As}}_{1ensuremath{-}x}{text{P}}_{x})}_{2}$ $(0ensuremath{le}xensuremath{le}0.71)$. By substituting isovalent P for As, the spin-density-wave (SDW) state is suppressed and the dome-shaped superconducting phase $({T}_{c}ensuremath{lesssim}31text{ }text{K})$ appears. Near the SDW end point $(xensuremath{approx}0.3)$, we observe striking linear temperature $(T)$ dependence of resistivity in a wide $T$ range, and remarkable low-$T$ enhancement of Hall-coefficient magnitude from the carrier number estimates. We also find that the magnetoresistance apparently violates the Kohler’s rule and is well scaled by the Hall angle ${ensuremath{Theta}}_{H}$ as $ensuremath{Delta}{ensuremath{rho}}_{xx}/{ensuremath{rho}}_{xx}ensuremath{propto}{text{tan}}^{2}text{ }{ensuremath{Theta}}_{H}$. These non-Fermi-liquid transport anomalies cannot be attributed to the simple multiband effects. These results capture universal features of correlated electron systems in the presence of strong antiferromagnetic fluctuations.