Doping evolution of antiferromagnetism and transport properties in the non-superconducting BaFe2-2xNixCrxAs2

Abstract

We report elastic neutron scattering and transport measurements on the Ni and Cr equivalently doped iron pnictide BaFe${}_{2-2x}$Ni${}_x$Cr${}_x$As${}_2$. Compared with the electron-doped BaFe${}_{2-x}$Ni${}_x$As${}_2$, the long-range antiferromagnetic (AF) order in BaFe${}_{2-2x}$Ni${}_x$Cr${}_x$As${}_2$ is gradually suppressed with vanishing ordered moment and Néel temperature near $x=0.20$ without the appearance of superconductivity. A detailed analysis on the transport properties of BaFe${}_{2-x}$Ni${}_x$As and BaFe${}_{2-2x}$Ni${}_x$Cr${}_x$As${}_2$ suggests that the non-Fermi-liquid behavior associated with the linear resistivity as a function of temperature may not correspond to the disappearance of the static AF order. From the temperature dependence of the resistivity in overdoped compounds without static AF order, we find that the transport properties are actually affected by Cr impurity scattering, which may induce a metal-to-insulator crossover in highly doped BaFe${}_{1.7-y}$Ni${}_{0.3}$Cr${}_y$As${}_2$.

arXiv comment10 pages, 12 figures

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• Hydrothermal synthesis and complete phase diagram of FeSe${}_{1-x}$S${}_x$ $(0\le x\le 1)$ single crystals
• Crystal growth and phase diagram of 112-type iron pnictide superconductor Ca1-yLayFe1-xNixAs2
• Neutron powder diffraction study on the iron-based nitride superconductor ThFeAsN
• Preferred Spin Excitations in the Bilayer Iron-Based Superconductor CaK(Fe${}_{0.96}$Ni${}_{0.04}$)${}_4$As${}_4$ with Spin-Vortex Crystal Order
• Doping effects of Cr on the physical properties of BaFe${}_{1.9-x}$Ni${}_{0.1}$Cr${}_x$As${}_2$
• Electronic specific heat in BaFe${}_{2-x}$Ni${}_x$As${}_2$
• Nematic fluctuations in the non-superconducting iron pnictide BaFe${}_{1.9-x}$Ni${}_{0.1}$Cr${}_x$As${}_2$
• Hole doping and electronic correlations in Cr-substituted BaFe${}_2$As${}_2$
• Crystal growth and characterization of a hole-doped iron-based superconductor Ba(Fe${}_{0.875}$Ti${}_{0.125}$)${}_2$As${}_2$