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

TL;DR

This study investigates how isovalent P doping in BaFe2(As1-xPx)2 superconductors causes a transition from non-Fermi to Fermi liquid behavior, revealing non-trivial transport anomalies linked to magnetic fluctuations.

Contribution

It provides systematic experimental evidence of the evolution of transport properties across the doping-induced phase diagram in BaFe2(As1-xPx)2, highlighting non-Fermi liquid behavior near the SDW end point.

Findings

Linear resistivity near x≈0.3 indicating non-Fermi liquid behavior

Hall coefficient enhancement at low temperatures

Violation of Kohler's rule scaled by Hall angle

Abstract

The normal-state charge transport is studied systematically in high-quality single crystals of BaFe$_2$(As$_{1-x}$P$_x$)$_2$ ($0 \leq x \leq 0.71$). 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 ($x\approx0.3$), 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 $\Theta_H$ as $\Delta\rho_{xx}/\rho_{xx} \propto \tan^2\Theta_H$. 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.