Effects of isovalent substitution and pressure on the interplane resistivity of single-crystalBa(Fe1−xRux)2As2

Abstract

Temperature-dependent interplane resistivity ${\ensuremath{\rho}}_{c}(T)$ was measured in an isovalent substituted iron-arsenide compound $\text{Ba}({\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Ru}}_{x}){}_{2}{\mathrm{As}}_{2}$ over a substitution range from parent compound to slightly below optimal doping $x=0.29$. The feature of interest in the ${\ensuremath{\rho}}_{c}(T)$, a broad resistivity crossover maximum found in the parent compound at ${T}_{\text{max}}\ensuremath{\approx}200$ K, shifts to higher temperatures with Ru substitution, $\ensuremath{\sim}340$ K for $x=0.161$ and goes out of the 400 K range for $x=0.29$. Nearly $T$-linear dependence of interplane resistivity is found at the highest substitution level $x=0.29$. This temperature-dependent ${\ensuremath{\rho}}_{c}$ and its evolution with substitution bear close similarity to another type of isovalent substituted system ${\mathrm{BaFe}}_{2}({\mathrm{As}}_{1\ensuremath{-}x}{\mathrm{P}}_{x}){}_{2}$. Similarly to the isovalent substitutions, the measurements of interplane resistivity in the parent ${\mathrm{BaFe}}_{2}{\mathrm{As}}_{2}$ compound under pressures up to 20 kbar also revealed a rapid rise in ${T}_{\text{max}}$.