Evolution from Non-Fermi to Fermi Liquid Transport Properties by Isovalent Doping in BaFe2(As1-xPx)2 Superconductors

Abstract

The normal-state charge transport is studied systematically in high-quality single crystals of BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ ($0\le x\le 0.71$). By substituting isovalent P for As, the spin-density-wave (SDW) state is suppressed and the dome-shaped superconducting phase ($T_c\lesssim 31$ K) appears. Near the SDW end point ($x\approx 0.3$), 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 $\hat{I}{˜}_H$ as $\hat{I}”\ddot{I}{}_{xx}/\ddot{I}{}_{xx}\propto {\tan }^2\hat{I}{˜}_H$. 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.

4 pages, 4 figures