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 BaFe₂(As_1-xPₓ)₂ (0≤x≤0.71). By substituting isovalent P for As, the spin-density-wave (SDW) state is suppressed and the dome-shaped superconducting phase (Tc31 K) appears. Near the SDW end point (x≈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 ΘH as Δρₓₓ/ρₓₓ∝tan² ΘH. 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.